Okay, those are not wall tiles. They're half-wall tiles and used for cut-away floors. The walltiles you want are under the ceiling tile itself (literally the block under). Also, bookshelves need to be one tile lowers as they have depth to them (thus why you can see the tops). As they currently are, they're floating off the ground and stuck to the wall - not good mapping. Lastly, the books next to the bed are wall shelves - they go on the walls.