A bit late, but today I played with the design. Maybe conisider this too:
Not sure if it's of any use now. Sorry for now vectoring and colouring, but it seemed like a lot of work for no reason. Besides, it gets the message across. Tried to go for that black marker shading feel but it's lost on pencils. Anyway, the dynamic is gone in favour of clarity. That's how I'd do it if I were the artist.