Cute design and a very nice render overall.

The unfinished edge at the bottom makes this look like an unfinished sketch rather than a complete piece. I would recommend cropping it to hide that rough edge. I would also consider putting in a background. Something simple like abstract shapes would suffice, it's just to fill up that empty space and possibly allow you to add an interesting secondary light source.

Always be mindful of your light sources as you render. You started to lose form in those three hair tuffs on the creature's head.

Keep up the good work!

~B-Man