Well, this page turned out to be a lot of trouble. I did as Mark suggested (sorta) and used more of a downward camera angle. I still think panel 3 should have M much smaller. (My original intention was to have 4 panels, but I decided I couldn't fit 4, because I can't draw small!)
I used a small pen on this page for the tiny shadow lines. I was trying to balance the pen and brush, but couldn't quite pull it off in a way that looks organic (i.e., that the two methods blend well).
The idea is for M to get smaller and the panel to get darker each time. I kept making it darker and darker, trying to maintain a hint of the background detail. I was only partially successful. I may be able to touch things up with white in Photoshop, but I hate doing that.