YT members waistfull and Laviniahyacynth both do outstanding work. We've bought a drawing from waistfull and was very pleased when we got it. We're also impressed by Laviniahyacynth's paintings that she has done.
An example of waistfull's art:
http://www.yorkietalk.com/forums/showthread.php?t=52162
Good luck in your search on finding just the right artist for you!