Capstone Part 2: Rocks

Perhaps the largest task I'll have during this sprint is creating rock assets for our terrestrial planets.  Looking at retro travel posters for reference, the mountains and rock formations are very simple.  Each has maybe 2-3 colors.  My other big reference for these rocks are the backgrounds of the Wile E. Coyote cartoon, because they have really interesting formations.

Using these references, I drew up a series of thumbnails.