Looks like you did some layer adjustment, and didn't get to a few spots. They are very hard to see if you are not looking for messups, but all in all the art is pretty good. A few things i have found that is wrong in this, and you may argue some of them.
The left ear. (The one on the right side of the picture) has a sharper bottom incline/decline junction point. Possible touch up, but not a major issue.
Layering white spots. Along the bottom near the little heart, and some spots along the hair points at teh bottom of the picture. You can see a very small line of white. This could be a layering error, but I don't see much wrong in it.
I hope my words don't offend you, and may help you in your art.