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.
Gender neutral decor ideas // Shelf hack using thick brown rope lashed onto a rustic wooden pole to create a clothes rail. Works great in a scandi, woodland, ethnic room design. Ideal storage solution and for hanging babies clothes in a nursery.