Thanks for the feedback everyone.
The reason I put the stone there was to have something coming through the plants that would help pull the eyes away from the driftwood. Maybe it needs to be moved a little more forward and to the right, and made a little shorter and broader. The driftwood was modeled after a piece I already have, but the stone I just made up, so I can play with it a little more.
Tony - The program I used is
Google SketchUp. It's free and pretty easy to get the hang of.