This looks more like a snakes head. Its the eyes that is wrong.
If you look at your reference images, you can see that they consist of the main skin like you have, and what you have as an eyeball is actually the eyelis plus a small eyeball.
The main skin suit as a placement for the eyes, and the extra set of eyelids is to protect the eyes when in the water..
I dunno if I can explain this with ASCII chars, but here I try:
(<o>)
() = main skin that you allready have
<> = the eyelids that you don't have
o = the opening for the eyeball.
Does that make any sense ?
Carsten Lind
Senior 3D Artist,
Maya Software Manager & Maya Instructor
LEGO Systems A/S