Experimenting with rocks this time with 4 colors which was taken from my previous experiment. When making the rocks, I also checked photo reference, but couldn't follow the detail nor the shape. I tried different ways when making the rocks.

I tried making rock by making the outline first using some kind of polygon feature then fill with to turn it into the cluster. Then I added shapes with different colors inside the cluster.

The other ways I tried is making the outline first. After that I added more lines inside the outline. After that I gave it colors.