one of the illuatrators i liked who uses gradient mesh is dustin watson. he does gradient mesh portraits of famous basketball players and he does them very well! i particularily enjoyed his poster of the faces of nba. they all have great form and coloring and look very dynamic (which is very important for these). he sells printed posters and even stretched canvases and I think it would make a great business if he could find a good advertisement technique to get his illustrations out there.