One thing you can do, is remove the lamps and put decent sized sconces on the wall. That will help open up the room and make it look larger, solves your issue of the wall looking lack luster, and gives you more side table space.

You could probably leave it blank, or you could put two or three small prints over the headboard.

Here's a quick mock-up, although it's not the right print at all.

Scroll iron work..its a thought

Yes lamps should be taller.

Mirrors behind the lamps with artwork above the headboard.

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IMO none of those examples with mirrors and artwork are successful assembled. If you use mirrors you might forego art over the headboard.

It doesn't look like you need anything over the headboard, however the lamps need to be bigger and taller.

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