Not re-used. That is, I want new art in every new book. No more reprinting art from previous books. Whew, now that that rant is out of the way.....
I think 4E needs to look like 4E, not some other edition. I prefer my art to be mostly realistic. There is one artist I hope to never see again, and if his work is there, it might actually dissuade me from buying any 4E works. I don't particularly like the blocky look in the first Pathfinder character pictures, but some of the other art there is good. I could go with less spikes and tatoos, that would be good. Parkinson's art is probably the art I've liked best over the years, though I really like WAR also. Much of the 1E art just isn't that good, but we have good memories of it.