Rock Study

I wish I could paint rocks. I want to paint so many environments with intimidating cliff faces, rocky mountains, imposing desert arches, etc. From what I gathered on the internet, the best way to get better at drawing/painting something is too just draw/paint that thing over and over while looking at references and thoroughly thinking about the nuances of what you're trying to paint. So I'm going to be doing studies of many different types of rock formations until I get somewhat good at them. Then I'll start incorporating them into my environments!

Any advice or tips would be helpful