Woof, I agree nothing on the wall... and seems not much wall space. If headboard were lower, art above?

Maybe in a balancing sort of way: pendant lamp could add an element from the ceiling... ? also, there's lots of pillows, and that could add a thought about balancing with behind the headboard, hope that makes sense.... !

Ryelba Bulbous Cage Pendant, Chrome · More Info

Pamina 1-Light Chrome Tubes Drum Pendant With Hanging Round Crystals · More Info

https://www.houzz.com/products/ryelba-bulbous-cage-pendant-chrome-prvw-vr~102329214

To draw the eyes up... Idk right size, to add bit of dressy -- W 15" / H 22.7"

3-Light Antique Bronze Bell Shade Crystal Chandelier Pendant Large Glam · More Info

https://www.houzz.com/products/3-light-antique-bronze-bell-shade-crystal-chandelier-pendant-large-prvw-vr~49314066?lid=35530942

Adds interest above with swirls. Height: 25" Width: 11-1/2"

... thinking that a large mass [a headboard is] needs a soft lightweight look, and that's a balance too...

Twirl 1-Light Pendant · More Info

Twirl 1-Light Wall Sconce Golden Silver Beveled Crystal · More Info

https://www.houzz.com/products/twirl-1-light-wall-sconce-in-golden-silver-prvw-vr~119209437

https://www.houzz.com/products/maxim-22005-twirl-1-light-pendant-prvw-vr~93186614

Can’t add pendants so that’s not an option.

To answer your question... yes, wallpaper that bumpout in the corner by the window.

Never apologize for a pet in a picture, especially one clearly enjoying himself on your comfy bed ❤️

I love your bed and the dog really seems to love it too! I agree, no wallpaper. Maybe mirrors on either side in front of the lamps?

following

I agree the lamps seem too tiny and no wall paper it will be lost behind the headboard which BTW is the focal point in the room. Love the dog

Or you could use framed wallpaper panels as the art on either side of the headboard.

Astoria Guest Retreat · More Info

That's almost brilliant - wp on the sides! Idk that it'd have to overwhelm the wall [with already a large headboard]. Might add the interest you're looking for, and even add softness: cause wallpaper can be less plain/stark than white paint.