I decided to do something fun for you. A peek into my process on a cover.
Step 1- Layout! This is where I throw stuff at the wall. When I've found something I like, I send it to editorial for approval.
Step 2- Once approved, I break it down a little more in Photoshop. Takes about 30 minutes. I just make sure that everything's working and throw in the perspective.
Step 3- I then print this out onto board in non-photo blue and pencil traditionally. I use mostly regular number 2 pencils with pink erasers. Super cheap. I like 'em because they're like a dime a piece and I can throw them out after a couple sharpens because I like a nice new pencil.
Step 4- I INK IT! This part is fun. I use a lot of Pitt Pen (XS and S sizes) Microns (.02) and Kuretake brush pen.
Step 5-I scan it in and send it off to a genius like Paul Mounts to color it and he returns magic to my email inbox! You can see a larger version of the colors here: