Keep it simple. Match one of the handle/style finishes. Put it to the left of the mirror rather than to the right.

I would not put the towel ring on the left side of the mirror near the toilet. If you go with a twig hook (?) I would change the pulls on your vanity to “match.”

Do you have an old towel ring that you can use as an example to see if you want a ring or a bar, or whether it should be left or right? Even a photoshop mock up might help. Whichever and whereever you choose it to be, I would keep it simple.

To the left of the mirror, simple, small, matching your current hardware. I think you’re over-thinking it.

You have a lovely bathroom. A SIMPLE small towel bar or ring is enough. (I prefer bars to rings, but that’s me.)

Perhaps a hand towel stand on the counter since walls space is minimum. We don’t know how often this room is used by how many.

Simple brass the same finish as your faucet and shower fixtures. What brand are they and is there a matching one, or close to it from the same company? I'd get a small towel bar to hang on the wall over the toilet. Too much going on with switches to go on that wall. Too weird to float it to the left of the mirror.

What about a simple stand on the counter

^ I always find the above always falls over

I have a hook, works great

Since it looks like all of your other hardware is silver, we might suggest just going with a simple silver bar. Here are two ideas for you from recent designs of ours:

Wine Country Charm · More Info

Traditional Bathroom · More Info