in the last photo the bulge you see on the pump that ends at that bolt is the high pressure oil feed... so if the gasket between the block and pump is going to fail it will fail there.
What I would do before digging deeper is remove that bolt where the leak seems to be from.
degrease the whole area.
fill the bolt hole up with silicone before replacing the bolt (if your lucky the bolt with push it into any cracks in the gasket)
then also rub a bead of silicon around the edge of the pump where is meets the block in that area.
do this when you dont need the car for a while. give it at least a night to set.