Love the books. Interesting how they've turned them the other way round to avoid the brighter colours on the spine! The muted colours are nice but I'd prefer to be able to see which books I'd like to read as opposed to having them for a display purpose
several hatchings such as cross lines and dots are used to represent the depth within this portrait. as seen in this image the darkness of an area is shown by doing a much more of a closer/tight hatchings.