I'm a bit late to this "party" but, for what it's worth, here's my ha'penny worth.
Head gasket? Most unlikely. It's been a few years since I had the head off one but I remember the oil drilling from the pump on the front of the block comes up at the left hand front end of the block (looking at the car from the front) where it then enters the head (sealed by the head gasket) and travels along the front, inside the head to the middle where it comes out of the top. on earlier engines it enters the spray bar for the cam lobes, on later engines it enters drillings in the cam cover where it is distributed to drillings which spray oil on the cam lobes and, on VVT engines, supply the oil to the solenoid which allows activation of VVT. Any oil leak from this system, involving the head gasket, is going to be very localized and probably seen on the front (pulley end) of the engine. To get leaks in the return drillings due to the gasket would mean a gasket so degraded that it would likely have blown through to the water passages long since. On older engines re-tightening head bolts/nuts was an acceptable and not all that unusual thing to do. On the old Austin/Morris stuff I worked on as a lad, with crushable multilayered gaskets, we would actually tell the customer to come back in 1,000 miles and we would slacken and re-torque the nuts and adjust the tappets. The gaskets would crush down so much it would affect valve clearances on these old pushrod type engines. Now-a-days I would be very nervous about doing this especially because most of them will not be torqued but angle tightened and will be "stretch" bolts which should not ever be reused. (I always used new bolts on the FIRE heads I've done.) The risk of snapping bolts and/or stripping threads must be considerable if you "fiddle" with them.
Breather pipe? A prime suspect. I've replaced them on every Panda/Punto there's been in our family. Most often leaks at the cam cover union. Shop4parts do a reasonably priced and good quality replacement.
Cam cover gasket? Very likely and especially if, like you've got, there's "oil everywhere". These gaskets are rubber and harden with age - they are definitely not a "life time fit and forget". I automatically fit a new one when doing a cam belt. Also don't forget to put a "squirt" of silicon sealant in the corners at each end (front and back) where the cam cover arches over the front cam journal and at the rear of the cover where, on older engine, the distributor drive exits the cam cover. If you don't use a sealant here you'll often get leaks. Even Fiat themselves advise to use sealant.
One last wee thought. Where the oil transitions from the head to the cam cover on the later engines, there is a wee "O" seal which is ajoined to the main part of the cam cover gasket by a wee bridging piece. It's possible for this "O" ring to become displaced during fitting and that'll give you a nice leak from the middle of the engine which dribbles down the front and spreads out sideways under the influence of the wind blowing against the front of the engine as you motor along. I put a bit of silicon round it to secure it in place when fitting - BUT, NOT TOO MUCH, or it might squidge out into the oil drilling whilst being tightened down and travel on to block an oil spray jet in the cover (or the VVT mechanism)
However, having said all that, as mentioned above, maybe it's just been sloppiness when topping up and oil has been spilled?
This foggy old brain has given up on me now. Can't think of anything else at this time, I'll come back if I think of anything. My gut feeling would be either the breather pipe or the cam cover gasket.
Regards
Jock.
Head gasket? Most unlikely. It's been a few years since I had the head off one but I remember the oil drilling from the pump on the front of the block comes up at the left hand front end of the block (looking at the car from the front) where it then enters the head (sealed by the head gasket) and travels along the front, inside the head to the middle where it comes out of the top. on earlier engines it enters the spray bar for the cam lobes, on later engines it enters drillings in the cam cover where it is distributed to drillings which spray oil on the cam lobes and, on VVT engines, supply the oil to the solenoid which allows activation of VVT. Any oil leak from this system, involving the head gasket, is going to be very localized and probably seen on the front (pulley end) of the engine. To get leaks in the return drillings due to the gasket would mean a gasket so degraded that it would likely have blown through to the water passages long since. On older engines re-tightening head bolts/nuts was an acceptable and not all that unusual thing to do. On the old Austin/Morris stuff I worked on as a lad, with crushable multilayered gaskets, we would actually tell the customer to come back in 1,000 miles and we would slacken and re-torque the nuts and adjust the tappets. The gaskets would crush down so much it would affect valve clearances on these old pushrod type engines. Now-a-days I would be very nervous about doing this especially because most of them will not be torqued but angle tightened and will be "stretch" bolts which should not ever be reused. (I always used new bolts on the FIRE heads I've done.) The risk of snapping bolts and/or stripping threads must be considerable if you "fiddle" with them.
Breather pipe? A prime suspect. I've replaced them on every Panda/Punto there's been in our family. Most often leaks at the cam cover union. Shop4parts do a reasonably priced and good quality replacement.
Cam cover gasket? Very likely and especially if, like you've got, there's "oil everywhere". These gaskets are rubber and harden with age - they are definitely not a "life time fit and forget". I automatically fit a new one when doing a cam belt. Also don't forget to put a "squirt" of silicon sealant in the corners at each end (front and back) where the cam cover arches over the front cam journal and at the rear of the cover where, on older engine, the distributor drive exits the cam cover. If you don't use a sealant here you'll often get leaks. Even Fiat themselves advise to use sealant.
One last wee thought. Where the oil transitions from the head to the cam cover on the later engines, there is a wee "O" seal which is ajoined to the main part of the cam cover gasket by a wee bridging piece. It's possible for this "O" ring to become displaced during fitting and that'll give you a nice leak from the middle of the engine which dribbles down the front and spreads out sideways under the influence of the wind blowing against the front of the engine as you motor along. I put a bit of silicon round it to secure it in place when fitting - BUT, NOT TOO MUCH, or it might squidge out into the oil drilling whilst being tightened down and travel on to block an oil spray jet in the cover (or the VVT mechanism)
However, having said all that, as mentioned above, maybe it's just been sloppiness when topping up and oil has been spilled?
This foggy old brain has given up on me now. Can't think of anything else at this time, I'll come back if I think of anything. My gut feeling would be either the breather pipe or the cam cover gasket.
Regards
Jock.
has probably given all the info anyone could need for this one. 
