Hi Debbie!
Megan from Bluethumb online art gallery here. I agreed that it's the perfect spot for another artwork. Judging by the piece you have hanging on the other wall, a large pastel abstract would be perfect.
I have a couple of suggestions for you:
https://bluethumb.com.au/rachael-higby/Artwork/a-gathering-storm
I believe this piece by popular artist, Rachael Higby would be perfect. She has some lovely abstract works, and I'd recommend checking out the rest of her profile.
Some other popular artists I'd suggest are:
Emily Snow, particularly her piece Rune
https://bluethumb.com.au/emily-snow/Artwork/rune-161705
Haruyo Morita
https://bluethumb.com.au/haruyomorita/Artwork/Soul-Portrait-2015-6
Artem Bryl
https://bluethumb.com.au/artembryl/Artwork/silk
Belinda Rogers
https://bluethumb.com.au/belinda-rogers/Artwork/clouds-belinda-rogers
Marnie McKnight
https://bluethumb.com.au/marnie-mcknight/Artwork/thoughts-that-surround-you
If you'd like any of these mocked up, let me know. I'd just need a less angled shot of the wall itself to do this :)
Hope this helps!
Q