Hahaha thanks bala123, I'm starting to doubt my abilities but actually as soon as I came out my 12 week scan I said 'it's a boy' then tried to convince myself otherwise for four week lol.
This is a tough one, your first picture I thought '100% that's a girl skull' but then I saw your second picture and the skull looks a different shape and more like a boy. I can't see a nub (not that I'm very good at spotting them). I think I'm more inclined to go with girl x