Just thought of another way. Ebay's marketplace has a public voting system for buyers on the trustworthiness of sellers who can rate up or down their real experiences on transactions, shipping, payment, etc. If only DeviantArt and other artwork platforms would implement something like that.
I suppose I should also add format. Style and format. If a client wants a drawing of Scooby-Doo not in a style of Hanna-Barbera but Milt Kahl lines that would be one category. They list that this Scooby won't be in an animation graphic, but redone in a format more fitting for something like out of the pages of a comic book. We have a Scoob that's reborn with the fluidity of Kahl-ic lines and lives in the domain of a world governed by comic sequential frame view. The pipeline in the search to find all kinds of artists HOWEVER would be always first based on style, the format would come as the second step and more of an optional selection.