Read my lips

I saw this amazing pic and I just had to draw it!
[link]

Materials:
A3 light grain Canson
3B and 9B Derwent Graphic
0.5 2B mech pencil
Tortillions and tissue paper
Scalpel
Eraser

I used the scalpel to cut bits of my eraser, to make the edges sharp xD I spent aprox. 3 hours, which isn't a lot of time, according to my standards xD