That's a really nicely shaped bit of wood, the rocks look to have a great texture and colour, I especially like the use of lots of small pieces of rock, it makes it more intricate and will help merge the rock into the substrate.
My one small criticism is that I think perhaps the rocks could form a kind of mound around the base of the wood, so that they slope up towards the wood.
Does that make sense...? I don't feel I explained myself that well.