Hi, I think you have several choices here, either ramp up the brown tones with accessories and towels

Or lighten with increasing the white accessories and artwork

or go bright and bring in some other colours that you like.

Or bring in some natural elements to enhance the sense of earthiness with baskets or a little wooden bench and woodsy artwork

You might be able to incorporate something similar but smaller above your toilet for storage, or a wood storage cabinet. Artwork and towel hangers might work on the wall next to the toilet. A large mirror over your pedestal sink would bring extra light to the space.

Light fixtures also add to the space brightness and interest.

I agree with the above responses. In a small space like this, a few statement pieces will make a big impact.I would go with one manufacturer so the finishes are consistent. These options are from RH.

Sputnick pendant, Ryland mirror, Lugarno towel bar

Great job so far. It's fun to add some art to the bathroom and it gives you an opportunity to add color, too.

Remove fake flowers and add a candle instead.

New TP holder that doesn't require both hands to switch rolls.

You can also get a toilet paper holder on a stand. This way it can be on either side, and exactly where you want it.
They make them in all colors and styles.

You could always try adding blue to the mix to add more color like in our bathroom designs you see here.