Looks good! Suggestions I'd make: the tank looks symmetrical, I'd change it up. You have the peaks of the rock piles all the same height, mix it up. The branch is dead centre too, I'd move it off centre and maybe have it more diagonal to give more depth, and tip it so the cut end isn't so obvious. If you like plastic plants, maybe a large one that comes right up to the surface and lays on top abit. Placed correctly the water current could add some movement to this plant as well.
Nice decorations, nice tank!