I had to smile, too, when I saw the book worm. Nice idea!
Some C&C that IMO will greatly improve the image:
1. the cabinet doors should have some space around them. For inset furniture doors you will need 4-6mm space on all sides to be able to open the doors (depends on thickness of door). Cabinetmakers usually build them with 5-6mm as a standard.
2. Chamfer all the edges. In the real world there is no such thing as a sharp edge. Even a scalpel is not really sharp. On furniture edges, that can be touched, always are chamfered or have a fillet of at least 2-3mm.
3. The grain on the upright cabinet parts should run up, too. Also the backwall and the vertical and horizontal parts of the wall are all seperate parts (at least if it was built it would be). That also means, that each part will be from a different part of the tree and have a unique grain pattern. To add that extra bit of realism make sure, that the grain runs logically on all cabinet parts.
4. I'm not quite sure, if this is supposed to be acorn or birch. Both however can be very tricky materials with its mirror grains (not quite sure, what this is called in english, german carpenters call them "Spiegel" which is mirror, so I'll use that). On this image it looks like you have mirrored the grain in the specular map (point 4). you need to turn those down quite a bit. Also I'd activate fresnel reflections and maybe even try a falloff. Those mirrors are barely visible when looked at directly and only become visible when turned perpendicular to the light. The normal grain will always be visible through them, too.
5. The books. Look at your own book shelfs. How many collections of identical books do you have?