Another suggestion regarding wood positioning - look up the "golden ratio". This is a principle that's used in design to determine the most aesthetically pleasing arrangement. I think the wood is currently positioned a little bit too far off to the side and will look better if it's moved a little bit closer towards the center (roughly 2/3 from one side of the tank, or more accurately 1/1.6 based on the golden ratio).
Regarding plants, sounds like you're off to a good start. You could also consider some java fern for the dritwood.