These sketches are done with the same pen and paper. They are done on location outdoors quickly, but not as quick as the tumbnails. They range from 5 to 8 inches.
These thumbnails are just ideas in my head that I have to get out onto paper. They are done from nature in minutes if not seconds, they range from 2 to 3 inches, and are done on really thin layout paper. I use a black Pilot G-2 pen, which I love the feel of on this paper.