Under the window between shower and bath to be convenient for both. Is there a heat register there? Towels dry faster if hung over a heat source.

Post after pictures when done :-)

Wet/used towels need to be hung to dry out after each use. I have hooks on the doors for that purpose. Extra towels need to be accessible on shelving or inside the sink cabinet. You also need somewhere to store each person’s stuff: I like individual plastic storage boxes kept inside the vanity: when one resident is using his/her stuff it is on the counter. Ideally, they put their bin away when done. It may take training. You seem to have some good wall space. You can add a cabinet and shelves above for storage.

Do you have large beach towels to hang? Or swimsuits- it looks like there's one on the tub faucet.

Move the single towel bar next to the shower to the wall on the left of the sink. Then double decker two towel bars next to the shower, one above the other so the bath towels have enough room. Add side by side towel holders under the window but not over the tub. If you want to add a grab bar over the tub, you'll need to figure out where the studs are for safe sturdy installation.

If you need hand towels at the sink in addition to what you have, a towel holder can sit on the countertop.

Not over the toilet or beside it (gross)

The room could use some paint. Then only use off white towels. Add a piece of art next to the tub.

I would consider mostly hooks instead of rods as they are easier to keep looking nice in a room.

How about a towel warmer/dryer by tub, under window and the shelving idea mentioned, and the artwork!

It's hard to tell, but photo #2 looks like a great spot to have a linen closet built in. You can put the towel bars(we have 2) under the window.

I had to add a rod, hand towel, and two hooks in my bathroom for wet towels.

following

Thanks so much everyone!!! I am grateful for ALL of the incredible ideas and super-kind photoshop skills. The niche ideas sounds great but thinking it might be best to try the idea out first with shelving over the tub area. Will definitely post updates...

Also a VERY special thank you to everyone for being kind about the current state of the bathroom towels. :) will update the thread as stuff goes in!!

following this for the updates.

Open shelves about the toilet works too.

Get a spiffy towel warmer (looks like a ladder) and install it where your current towel racks are. This'll give you lots more towel space, and add a bit of luxe while you're hoarding pennies to renovate.