go to jeremy taylor at skinquest.. he is an incredible artist with great prices. he is amazing at portraits.. very life like but is also great at everything else, including coverups.
you can check out his facebook page and he has tons of his work up there..
the best by far that i have found in kc, and i have checked out many many portfolios..
My latest one was done by a friend of mine who works at Skin Illustrations in Overland Park.
The important thing is not to focus on the studio alone. The individual artist is what makes the difference. The studio should be clean and have good facilities, but the artist is the one doing the work.
And don't forget to tip, especially if the artist is not the owner.