I've been getting this question a bunch of times so I finally got to compiling this all in a single post. Gonna be showing how I usually work on a piece dissecting my old Tomb Raider one. Not my best work, but I had all the steps and files saved for this one so I could explain every stage.
So take a looksie at the link below and if you have any questions drop me a question in the blog!
P.S. A lil disclaimer: this process does not apply to my sketches and stuff. Those suckers just happen. Slap some paint, scribble around for few hours. Done. Next.