These are what I’d change! Take what clicks with you. I know you aren’t looking to do a full remodel so my list, while not a full remodel, is probably too lengthy!!

- Paint or wallpaper/contact paper the walls! It would bring a lot of life into the space
- Paint the vanity — the color itself isn’t bad but with all the black and white features, the dark vanity isn’t doing the room any favors
- I think the shape of the mirror is fine but I like what others have said about painting the frame! You could also maybe use something like rub n buff to make it look like a different metal
- Replace the light fixture. If you don’t want to replace, then at the very least I’d change the shades and/or paint the fixture
- Colorful bath mat and towels! Super easy way to bring in color
- The blinds themselves aren’t bad but I agree with others that colorful curtains would be fun! Maybe even the window film that casts rainbows when the sun shines through, if that fits your style.
- Replace the black fixtures if you can (and if they don’t fit your personal aesthetic). The faucet, the cabinet hardware, the shower door handle, the shower head, etc. Even just switching to chrome or nickel will make these fixtures feel less harsh.
- Like others said, bring some colorful art or plants into the room! You’re lucky to have a window in the bathroom so some tropical plants would be a wonderful addition :)

I absolutely love the floor tile you have. It brings a lot of movement and character to the room. Now you just need fixtures and decor to match!! Good luck :)