You didn't ask for C&C but everyone else is giving it so... 3/4 of the image is overexposed, 1/4 is underexposed, and the underexposed part does not bisect the image so a GND filter is not an option. To get this shot right, you're going to have to shoot at a better time of a day, get a light on the dark side of the rock, modify curves in the RAW, or blend a few exposures together.
If you didn't want C&C, my apologies.