Is that the actual room? IMO thta bed looks like aboard to sleep on but this might not be the actual space if not take pics of it. Maybe a bit more info too

Adult or child? What else is needed such as lighting?

I would definitely add cozy fluffy bedding to soften the space. Also a small side table with a light and are pieces on the wall. Maybe a small plan by the desk. The space is fine just not finished

You might consider looking at bedding and artwork that combine the two colors green and blue. This should help make the space feel more cohesive. Please take a moment to look at a few designs below to help you more.

Scandinavian Modern · More Info

The Van Buren Project · More Info

Aberdeen Living · More Info

Sunrise Model · More Info

Home Is Where The "Hart" Is · More Info

LOVE this fresh combination of colors! Think the color of trees in the spring and beautiful blue skies. Fresh, clean, wonderful! I would find a fun rug to tie the colors together. Check out AnneSelke.com for Dash and Albert striped rugs in spring green/blue/white combination. I would keep the bedding crisp white. And use a pillow in a darker bright blue and one in spring green on the bed. Then…ART on the wall between the bed and the window. A modern poster/abstract with LOTS of white, bright green and bright blue. Keep it simple, clean and cool!