I really like the mood in this piece. You can almost hear the subtle sounds in the room; the boy turning a page in his book, the sounds from the fish tank and lava lamp.
But his room is so tidy! I wish my kid's room was that tidy. If I had to point a finger at something, I would like to see something lying on the floor or on the bed/furniture. A bit of gunk in the fish tank or a picture frame that was tilted. Something that told me that the little boy lives here. I know this is just practise, but perhaps you can use my ramblings in a later work