The best dark skin texture I've come across has to be by Rebelmommy called "Lucretia" that's sold over at RDNA. ( www.runtimedna.com/mod/bcs/index.php )

Back to topic...You can see more of Gioia over at the creator's website: www.tonypuryear.com/home.html#bwtop Just scroll about two thirds of the way down the page for more views of Gioia and some other characters he's working on.
In terms of skin/texturing, it doesn't look as if the textures are very realistic. Then again, I think he's going after cartoonish models with exaggerated body features look than he is with realism.