Rock to cut off with layer mask.
Size of image: 3000x2250 px in 300 dpi.
How to use (sorry for my poor english to translate):
In Photoshop, open "rock 3" and "rock 3 mask",
load selection of layer mask (in channel > Ctrl+clic on layer)
make selection > memory selection. Go to "rock 3" window, selection > load selection, and Ctrl+J.
If you use this file, credit and link me please
Link to your artwork so we can see your work