Help me decorate my room

I just moved into my new apartment and set up my room. It’s looking bare, so help me decorate. Leave your suggestions (and pictures!) down below. I want to keep it budget friendly; I’m open to DIYs.

I may move the changing table to the other side of the room and replace it with a bookshelf. I have a lot of POP figurines that I want to put on display.

The color theme of my room is white, black grey, and white. I am open to accent colors.

PS. The window sill in this room is really deep, so I’m using that as a desk. I don’t plan to get one either, because I don’t really use one.