Well, this is a draft I did on paper in college, I watched my drawing in pencil and has played on the computer that he gave, I think the paper was more enjoyable, so I came here I asked for suggestions and tips for you to improve, is at the initial / draft I hope it ends with a great job.
Ask:
Identification:
Note 1: Green teeth: They are a type of dirt, he is a guy who comes to your oral health, you can see the position of the teeth as well.
Note 2: His eye has a certain type of cracks, cracks are not is that his eyes are getting red.
I think that's all you have doubts, if they ask more about the piece that I will be here to answer.
Thanks, waiting for the tips of the gods.