I paint and love doing charcoal portraits. Then there's the brilliant super mod Masqua with his very eclectic style (if I can be so bold as to pick a style ).
You'll find his thread with some of his works here: Test Flight
Browse around the Art Forum and you'll discover some amazing artists, many of them "bragging" with their talent.
Just keep in mind that selling/buying stuff on ATS is against the Terms and Conditions,
so perhaps if you do pick an artist you may rather want to contact him/her via U2U and find out if he/she has a different site where you can do