Can you please let us in on your work process by briefly describing the steps you go through when you paint? I mean do you use line sketches or do you directly use paint, etc. I would really appreciate that. Your work is an inspiration. : )
Not to speak for the artist, but just from the looks of these sketches, I can see that some of them have underlying linework. My guess is that he started with a loose line sketch and built up values on top (or below depending on layer choices) of those.