It's better than my first attempt
I think you made the back too small and the part where teeth go too long (Don't forget the mandible is missing, maybe you've accidentally tried to compensate?). I'm not very well versed on anatomy though. I've gone with a rather clean version - possibly too clean for my personal tastes even but whatever.
A few things:
-Unless you need for them to grab attention you don't need to seperate the teeth like that. You can fit considerably more in if you ditch their outlines.
-I'm not sure of where your light source is. You can shade your outlines to help with that.
I'm not sure why but the orbits still look a bit funny, but maybe you can figure that out.