That is so cool! I have been thinking about light-painting one of my cats for the POTD challenge. This cartoonish look is exactly what I had in mind. The inversion is genius. I had no idea how you did this until I read your notes. You draw better with a flashlight than most do with a pencil. Nice work!
Thanks for the wonderful comments. Unlike other people's entries, this is not the light source, but the light being shined on a surface, in this case a door. I had a flashlight with some tape over it, which created an unusual "brush shape". Then I went right up to the door, so that for all intents and purposes I was drawing on the door with the flashlight, except that I was working blind. That was how I was able to get the variation in line width and intensity. The white lines that were mentioned were from planks in the door.
This is superb.
Really manages to pull off the spraycan effect and has a funky vibe to it. Not keen on the white lines running through it - they break the shot up too much for me - but otherwise top notch.