Brush marker and Sharpie Pen on regular sketchbook paper. I closed my eyes and randomly picked 3 markers from my collection, and filled in the sketch that I had done previously with them. Try it!
I wax specific areas (paint with wax) and light from the back...in the end it will be in a glass frame to hang in a window....tben the waxed areas will glow!!!
Unaware - i don't think there's a good way to find out you're a robot...but having your skin melt off your arms to reveal a metal skeleton is probably not ideal.