Honestly, the three best artists for this style are hard to deal with.
There's always Joe Mad.. but yea. Then there's Artgerm... but again, yea.. Then there's Ale Garza. But I wouldn't ever trust dealing with him cuz he's shady.
If known/big names aren't a problem for you, there are a couple of people from DeviantArt who would do a good custom.
Sakimichan does great stuff, but he's digital.
Rob Duenas does fantastic cartoon stuff, and his 'saucy' pieces are fantastic. And the last person I can think of would be
Mike Maihack, who does more "cute" stuff that would look good maybe with a Dragonball Bulma/kida Goku scene.
Good luck =)