Nice sketches. Love the DOs. In regards to scanning flat: Put a heavy book on the back of the sketchbook, but not on the spirals. Make sure the page you're scanning is laying flat on the bed. Sometimes I stack several to make it lay flat if the paper is crinkled. Scan with the lid open. Don't look at it.
Thank you, Kris! Great tip. Seems obvious if you think about it. Duh.