I did a quick sketch of Brainiac, probably my second favorite Superman villain (the first being Bizarro).
I never understood in the comics why he is called a computer brain/robot, but he clearly looks like a fleshy, green alien. I do kinda like the cyborg aspect of Brainiac though, where he his an alien but also has obvious robot parts implanted onto him.
Since there are, like, a billion designs for Brainiac, I just made up my own design. If you can't tell, that long thingee in the background is his serpent-like tail. Also, Brainiac has a history of making giant ships with his robot face on it. It's weird, but that is something that he does in almost every appearance.
Brainiac was drawn with a blue pen and then done over again in a black Crayola marker. If it hasn't occurred to you yet, I work at a school.