Pretty good on the technical side, however, I think you need to rework the forms on the face a bit. The mouth is a bit too far from the center, and the shading reflects this. The eyes are uneven in height which gives a bit of an uncanny feeling to the character making it look like it has a serious medical problem. The last thing to watch for might be balance in the character. While I understand the concept of chibi, making sure that the character has balance in this style is so much more stressed due to the head size and implied weight of it. Just keeping an eye out for general stuff like this is helpful. Keep up the good work!