Well now a days, its kinda hard to find those that still draw GW or to even find those that know what GW is or who would be willing to try and draw them regardless. Here is a list of those I have commissioned before or bought their art at cons:

jurty Check her website on her info page and you can find her contact info there.

telophase I bought a Naruto pic from her at Akon this yr. You can see that here. On her info page, check out her Deviantart link that has her art. Very nice stuff.

tesstrosa I had a FMA RoyxRiza commish as well as Shigure pic commished from her this summer. Her prices are pretty good too pending on if you want a sketch, inked, or CG'ed. Here is the RxR pic. (I posted my Akon goods back in June but I really haven't pimped the art yet). And this was my Shigure commish by her. She will send you the finished product in the mail.

I'm sure if you ask them (aside from Jurty), they might be able to try it out. I know that Telophase has done GW art before.

Oh and before I forget, Spoony does some very nice GW art too. She lives in the Dallas area too (how lucky can I get?). This 1xR I bought from her at Akon. She takes commissions too, I think her email is faprints@yahoo.com try it out and see if it is correct, she seems to reply pretty quick. Plus she's going to be at Afest next month when I go.

Hope that helps.