Can you post a photo of the room? Do you want a dark or light background for the wallpaper? Are you considering the leaf wallpaper in the last photo?

If you are looking for a dark background, I have this peel and stick wallpaper on an accent wall in my bedroom. I think it would go nicely with the items you have selected. I also have a very similar rug in the room with the wallpaper as well.

Peel and Stick Wallpaper Modern Black Geometric Wallpaper 17.71 in X 511 in Self-Adhesive Removable Wallpaper Matte Wallpaper Easy to Line Up for Home Christmas Decoration and Furniture Renovation https://a.co/d/5DcPhoy

Thanks - updated with some room photos...

I'd hang the curtains and the painting and then see if you really want wallpaper still. The right wallpaper could be a great maximialist look, but I also think you have a good thing going with your current selections.

Gold Cranberry Poise Peel and Stick Wallpaper Bolt · More Info

or from Target

The other way to go would be to make your wails like your textured surfaces -- velvet wallpaper, flocked wallpaper -- to be like your chair, rug and file boxes

https://wallblush.com/products/making-me-blush?variant=39652789289023&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad=1&gclid=Cj0KCQjw0bunBhD9ARIsAAZl0E0eV_3ld66ChTnXcr2nA2c6WW3wvg1J4vIcTprSVPM6cvORu2mYUy8aAmBYEALw_wcB

this isn't exactly peel and stick but it is self-adhesive

https://uniquelywallpaper.com/products/pheasant-feather-wallpaper?variant=40144109043873&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&srsltid=AfmBOoqPE8Pv1f7j9_NKmR23SoYH831N989vVixEIO0sxTvhgZ1xDqHaD3U

What about trying a fun pattern behind the artwork? Maybe something like this:

Modern Condo Reimagined · More Info

Or you could choose to keep it the same color and just hang the artwork, like this:

Florida Coastal Retreat: Home Office · More Info

The overall style is great but if it were an office it might need some green to make it more invigorating.Like artificial trees.

I’d test out something like a pale blush, but in a textured paper. Something that glowed in the light, that looks good with greys and browns and silvers. The art and the brown keep it on the mature side.