hope I am not too harsh in examining the scape - but here are my thoughts:
1) for a scape to have depth banking of substrate should be from front to back, and should be al linear as possible(but depends on scape - your's requires one) to create defined lines of the scape.
2) hardscape should be of same colour. Different colour is always a major distraction.
3)The scape totally lacks flow. I like the right back rock arrangement but if you notice it all gets lost from there on, the rocks seems to be just stacked where-ever possible.
I recently scaped something in these lines adding a pic for reference to show how it can be done(hope you don't mind me posting the pic)..very simple though..a bit of height is what you need