You are still lacking a lot of detail on face.
First thing first,Every living creature with nose has a pair of eyes loop around their eyes ,you are still lacking those.
Second thing is ,It’s too flat from the front view ,seems like you missed their cheeks,the forehead as well.
Third,The face is too wide while the height from top to bottom is too low.
If you are going to sculpt something ,you should get some reference first,draw them out without any reference is not going to yield a great result.
Have a look at these reference for skull part might helps you get a better understanding of anatomy
https://www.google.co.th/search?q=Owl+skull&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjLxcnfkrzYAhXEMI8KHQY_Bp0Q_AUICigB&biw=1707&bih=817
Cheers,keep up.