Help decorate the nursery!

Hey everyone, I need some help with decorating my sons nursery. I lack ideas and inspiration on how to design rooms 🤦🏼‍♀️

I’m currently living in an apartment so I’m limited on what I can and can’t do. This is also the smallest room in the place. So far I’m leaning toward Harry Potter inspired/ stars and the universe kinda theme. But I’m open to any ideas! 😊

Pictures of the room right now. The crib I’m at or may not be what I use. It was given to me for my daughter and I just put it in there at one point.

Room from the doorway

One side of the room

Little built in shelf in the wall

Side that inspired the Harry Potter idea. Maybe make it look more like brick?

Then just the one window it has