Hello this is my 2nd attempt at making heads and picking up a few tips and tricks along the way has helped. I have a few different images of one head...Please rate it and tell me what I could improve on and if you like, give me a few hints I always appreciate.

Also if you could, tell me whether I could sell it and if so how much I could get out of it.

The colors/opaque properties of the images can be changed. All of them.