Hello! i’m a student on a budget but i’d like to make this space work better for me.

Things i have thought about:
– hanging the guitar
– hanging a mirror
– doing a gallery wall (can’t decide where is the best place, if over the bed, on the corner of the bed, etc…) BUT with just posters and washi tape because i can hang but not a whole gallery wall
– removing that awkward colorful string lights
– using the wide of the wardrobe as decoration or storage/both
– possibly doing a little shelving on the walls, somewhere

things i have bought but are not in the photos:
– a small gray shoe rack (50 cm x 60 cm, probably on the bottom side of the wardrobe)
– a vertical plant holder (last pic, probably on the left side of the table)

but i’m not very sure how to do these, i mean, i don’t know where to put things and how to create spaces and cute vignettes that make the space feel balanced. Also, i don’t know what to do with color because i think the floor is very nice and i’d like to stick to the palette but also add a little bit of something unexpected to complement everything. And in general i’d like to get some advice.
Thank you everybody !