Good work. Here is some things I would like you to fix/add though, I hope they don't hurt your feelings.. It's for your own good *_*
- the right eye is a little low, and angled wrongly, try tilting it over a little to suit the left and move it up a little
- the ear looks weird since I believe it's placed wrongly, try moving it down a little and give it a little more detail, also show the year more *_*
- last of all, I believe It is overall a great piece, I think you should start with shading and tone like Uzumaki Kato said