Say your wife my wife would be amazed with your designs

Regarding titles. It's not a questions that your titles should be shorter, the point is that I think that they are not titles but descriptions, or say, short descriptions (in fact, teasers). From a marketing point of view you could add suggestive titles to your wife's works, as such beautiful products deserve like "crystal wind", "swans song", "moon colors", uhmm, whatever. Accept that both as a technical comments and a personal comment.

Regarding Amazon listing, they sell books, not beautiful pieces of art that should catch buyers eye instantly. In that sense, table list is likely to be a good solution for amazon, in fact the cover it's what should inspire you to buy the book but the content and size, and pages, and so on, and on your site is the other way around, it's the pic and not the explanations what will lead people to buy your products. Every shop has different marketing goals and techniques and that's what both kind of listing are necessary on a shopping software. On that sense I would even increase the size of the thumbnail presented on the grid (imagecache settings) and reduce the number to items shown at once to maybe 8 or even 6, and only two columns at a time. All that IMHO

Regarding your amazon pic, it's true, more and more e-shops use the "other buyers also bought" box as a way to move buyers to keep buying other interesting items on the shop. That's what I'm trying to get with the uc_product upgrade suggestion