Getting a background would help. Backgrounds help by establishing contrast and by hiding wires. Is that a filter just sitting next to your rocks? You could move one of the larger ones in front of it or move the filter so it's not just in your face.
That piece of wood is really interesting. I wonder if you could turn it onto its side to make an arch? The eye naturally goes to the tall rock, so at first I didn't even notice the tip of the other piece of wood. If you can adjust so that you've only got one main focal point in the tank, I think it would be an improvement for your scape. Of course, more plants are always great!
A background would be the first way to improve though (and, as always, more plants!). You can do a homemade background out of a black trash bag if you want to save some money and make one to size.