very very cute. I agree with hardrockangel: You need an outline under the horns to make them read as horns. Also the right horn seems to be a little bit too high, like one or two pixels. But overall, very very sweet piece
I really like the pose and how sweet the face looks.
The horns, however, don't clearly show as horns to me. At first Ithough they were differently coloured streaks of hair. However, all i n all it's a good piece. c:
Simple, but cute! 
Although, I do want to say that the darkest shading under the hornes is rather strange.
@hardrockangel, neofotistou, 8BitGinno: thank you for pointing it out! I'll get it fixed :D
@Gecimen: thank you!!