I believe Shortstack is seeing the curved portion of the center of pictures two and three. Could be, and also what may be a shadow owl also in the lower end. If viewing on site I would try closing one eye or viewing through a cheap "throw away" camera's view finder. This may give you a different perspective. I have taken the liberty of marking the photo to show an alternative representation. (Pregnant Lion headed Goddess looking to the left)
I definatly saw the 'snake' the first time i looked at the pictures... but i've never seen a snake like that... I've seen several of them carved into rock, but never saw one carved out of rock... doesn't mean that i know what i'm talking about, just saying what i've experienced... good luck on the site.
S.I.R.