Maybe use old white no4 and nice big gold frame mirror?

I like the blue.

I would shift the existing print over to the right and have another artwork on the left. Something with a lot of white again and ideally a different shape - something reasonably tall and slim would look good.

I would consider painting that table either white or a very pale grey, and instead of the potted plant I'd probably put something metallic gold in the centre (or bronze, brass, rose gold or copper). I might also have the second artwork with a gold frame. That sort of blue tends to work very well with yellow metals. Just a small amount in each case, and maybe an 'antiqued' gold or whatever.

I would look for something that fills the space more but is simple and elegant. Maybe a mural of some kind. You could check http://inkmillvinyl.co.uk something that starts one side and moves across the wall.. maybe in white. If you don't have the flare to design it yourself someone at ink mill maybe able to help or I (and I am sure others) offer a service for designing such pieces.

In all it doesn't cost more than the price of a good large mirror and can be removed, added to etc as required. I hope it helps with an alternative idea :)