I found the scan, but the character which you used looks like a vector, so if you used of somebody else, please give proper credit. And if you made it yourself, maybe you can upload it under your name as indy art.
Also if you want to have tips for improvement, maybe would be good to write a more detailed work process, how you got that far and also linking the used images, how much from it actually you did by yourself. Is easier to help that way.