so here are my thoughts:

1. do not paint those cabinets they are very nice, I would add drawer pulls and knobs

2. add a roll-out cart with baskets or storage for that unused vanity area, that will let you keep some of the "kid" stuff snd toiletries concealed.

3. light fixtures just don't fall out they should be strapped to the actual junction box back there which makes me go hmmm. most electrical boxes like that are round so im wondering how DIY that was done.

4 add a cabinet behind the toilet as well.

I would add built-in shelves in the unused vanity area. Then you can add some great baskets to store all the kiddy stuff. You have 3 different browns, the cabinet, the floor and the shower tile. Because of this, I would paint the cabinet white. Change the shower curtain to a white one. Definitely add cabinet hardware and replace the mirror with something more current, a round mirror would look great. Whatever finish you choose for the cabinet hardware, use that same finish in the new vanity light. I too would be concerned about why the vanity light fell out, sounds suspiciously like a very bad DIY job. If you are not handy, find someone who is to have a look at it. The junction box is supposed to be attached to a stud. If it isn’t, there are alternate solutions but you’ll need someone who knows what they are doing. And one more thing, I would remove the tile around the toilet paper holder, looks weird. It won’t take much to get this bathroom looking good. And it can be done on a budget.

Thank you both! We had an electrician come to look at the light which prompted this replacement. He said the same thing. Looks like a bad DIY job. Think I will go with the round mirror and match up the hardware with the mirror and lights. Also love the storage ideas!

I agree with all what Brown Dog said. I would also paint the floor vent the same color as the wall.