A lot of the design work of T11, Dan and Dave, Zenneth Kok, etc. is the creation of a gorgeous card backs combined with familiar, recognizable faces on the cards. Most of their decks do little more than tweak the colors a tad, tossing in darker reds or metallic inks - which is just fine. Zenneth himself said that he does this intentionally - his choice of making the Bee Coterie deck was influenced by the fact that of all the USPC brands available in China, the Bee brand is the most commonly used and recognized. (And forged, too, but that's the subject of a different topic...)
Mind you, this is general purpose advice - you may find venues with audiences that are equally or more receptive to custom faces with various themes, such as almost any Karnival deck in a goth nightclub, a pack of Legends at a cocktail party in Hong Kong, a pack of Sentinels at a Freemasons lodge or a pack of Fathom for a professional divers' group. But unless that's where you perform exclusively, you'll want to have a more general-purpose deck on hand and even then there will be people questioning the legitimacy of the deck. It happens. So what? Let them see the deck, even handle it if it's something not too rare and precious (in which case, why the hell are you using it for magic?!) and make up their own minds. Some skeptics are dyed-in-the-wool unwilling to be convinced. That's their problem, not yours!