I would do the boxes next to each other (or shelves for art supplies & books), add a cushion on the boxed (shelf area) with textured pillows. Then add a leg to support the desk on the end with two chairs.
Transform your kid's bedrooms with one of these mountain wall murals. Adorable woodland animals are nestled amongst the pastel mint trees and snowy mountains. The neutral colours work a dream in bright and modern nursery spaces.