It may help if I post a GIF of the environment art process. It is still not finished but you start with baby steps and then work your way out until you are satisfied with the result. There isn’t a magic formula to it, at least I don’t know it but what I learned during my period with Ryan is the concept of verticality and scale, also having a limited color palette to work with and stick to it and some techniques to create the models faster like the Ultimate Trim so no high poly model was created so far in this scene (except for the organic elements like rocks). So just start with what you know and try to create something, that is the way I found to be the fastest. You may want to start with the basics like material creation, 3d modeling, uvs and maybe create some props until you are comfortable working with 3d. I’m far from being an expert but that is the advice I can give you.