Best way to treat a 65 Square foot room

Hi all, I have a 65 square foot small bedroom that I want to treat to get a better sound. I have a double door cupboard at the back and a window at the front where my monitors are. I've been thinking of getting an acoustic curtain to go over the window and some of theseAFHS Pro Acoustic Foam Home Studio Room Treatment Kit 24 tiles & 4 Bass Traps | eBay



Also I have attached some pictures of my room on here, the cover at the front of the room has my monitors underneath and that will be my listening position.



Front of room:



Back of room:





Back of room

Best way to treat a 65 Square foot room