Hey, I have an idea about why it doesn't quite look right: the textures are too similar and they all reflect light the same amount and in the same direction. On a paper bookshelf, and in the law office you mentioned, there's DIFFERENCE: some are more matte, some are more glossy, some are thicker than others so they have different amounts of shadow on them from adjacent books, and the dust and physical bumps/divots on the covers/spines (such as the raised/embossed lettering) reflect light differently. And these differences create a kind of richness that your test image is missing. The more of those effects you can replicate, the better.... is there a way to use paper that's pretty matte, and have some of the covers print more glossily than others? To use the thickness of the physical box/book to estimate how much shadow it would cast onto its neighbor, and digitally composite that in? To add a bit more digital dust to the covers of the older works?