I'll try and be as constructive as possible. The overall design is well done, I like the crescent silhouette this makes, and the facial expression conveys a good mood. The main problem I see is the proportion of the chin to the rest of the face, as well as the unevenness of the eyes. It becomes hard to tell if she is looking with her face cocked to the side or not, and although I know she is completely facing the viewer, the chin and unevenness makes it seem that way. It tends to help to reverse the image with a mirror or flipping the page if you want to see whether things look even. Great job nonetheless!