Yeah,very nice little composition. The wood is in a good position in my opnion. Maybe tilt it down more, but only by a fraction.
With the planting, i would sugest, planting your R, wallichi behind the rock and wood, were the two meet. So its to the right of the main rock on the left,and behind were the wood is wedged against the left rock, does that make sence? Hard to describe whith out putting the pic in photo shop.Aim to put it more behind the main rock, work with the rule of thirds, so it would be on the left third virtical.