I could see a set of three pictures with white or silver frames and anything really that just incorporates your room's color. Make sure they are large enough to fill most of the width. You may also want to add more pillows and large shams type pillows for a more interesting and complete look. Your lamps are a bit too small (see lamps' proportions in pictures). Hope this helps.

This is an eclectic space but the bedding looks like a good fit for an art deco space -

Huge artworks and mirrors that are leaning would still have to be attached at the top somehow, wouldn't they?? Surely they would be dangerous otherwise, especially in areas prone to earthquakes (even small ones) and in homes with young children. Imagine something that size falling onto someone!

My inclination is something with colour and with a connection to elements already in the room. A dark timber frame and a deep coloured strong image, wide enough to link across the chairs and not seem squeezed between them. Here's a random red-toned image from the internet that I have stretched into a dark wood frame. The hues link to the cushions without matching tightly and add richness and warmth.