Here, I find that proportion/ scale is most dominate. In 3-D design, we measure in comparision to human size, so obviously this rock is larger than man-size. This gives one the sense of being dwarfed by nature. Additionally, the precarious slant of the rock and its prop against the adjacent boulder gives the scene an omnious feeling, as if it could fall at any moment. The diagnol crack and the tree growing slanted reinforce this focal point of tension in the composion.