Hi, and WELCOME TO THE FORUM! :wave:
the whole area is covered in oil, really you need to clean it all off with degreaser or a steam cleaner and then start looking for the leak. Oil can be spread quite far around the engine, and can run down little grooves etc so often it shows up some distance from where its actually leaking.
I would agree with oldhammer that its probably the coil pack seal, or it could be the rocker cover gasket.
failing that, post some more pictures from higher up on the engine, and from different angles, and that might give us more of a clue.
Alan