Copic Marker Sketches

I'm working on a comic book. I'm trying to figure out what process will work for me ... I'm looking for a good balance of speed and quality. While waiting for my computer to handle working on several 300 dpi 9" x 12" files, I started doodling using an erasable blue pencil and warm gray Copic markers. I liked the process, so I continued and did a few more. These are the better of the lot.

Something about the cool blue of the pencil and the warm gray values felt nice. Complete. More so than the labored black and white inked drawings I was working on.