This is impressive. I love the 3 rocks on the right that have been used to create a cave. The mound on the right draws your eye and is contrasted by the chaos of the rock pile to the left. I think I would have reduced the rocks on the left to a lower height and removed those small rocks from center top to create a small valley effect. The large rock perched high to the left and the jagged rock below and to the right need to be rethought.