To me, it's quite helpful to see how other artists work and it's interesting to see their progress no matter if it's digital or getting gritty with ink and paint, it's all the same. Tools. And whatever works for you, is the right tool. Personally, I change tools a lot, it's just a lot of fun. For instance, I've never used gouache for anything else than plain textured backgrounds before and now I wanted to give it a go with a character of some sort. I chose to do a study of an inter dimensional monster from a comic that I'd like to do.
As I went on with this thing, I took a couple of snapshots: