Currently I have to make a ampharos signature, a Paul avatar and a Slowking avatar. I also have someone else who wants another banner from me. xD I am pretty busy with requests right now. ^^;;
You definitely keep improving with every one you make. Your latest one is actually really good, so if you keep making them like that, I'm sure a shop would probably go over well ;D
Hey thanks for the comment on my banner, that one is also my favorite, I don't know how I did it but something just came to my mind and then there it was. xD