just to say....

since your detail is modeled in, i'm betting there's a lot one can do some nice work with just procedurals and tiled textures.  imho, it would be very nice if you gave your details different zones, so  they're easy to control without a map.  for me, that's the frustration of quickly playing around with (for instance) the Marauder set at DAZ.  i'd have to make a new texture (or get interesting with my material room filtering abilities)  just to change the material of details that are modeled into the piece, and i'd have to do them as a mask.   it's an excellent product, but this keeps me from using it much.

Arien, i'm curious: what pixel size do you make book covers on average?  and what rendering application do you use?  if it's not too OT?