In the case of this photo, the rock is lit from low-right, and the rock behind it is lit from low left. There is a lesser light coming from upper left. This probably looked very interesting, in person; but it is difficult to wrap your head around it, in a 2d photograph.
It also looks like you darkened the edges of the image, and took down some of the light on the upper and lower portion of the rock. This didn't help. It would be better, if the rock did not extend into the shaded area of the image.
If it was lit with colored lights, it may be more interesting to see the color image.