I made this drawing in between classes, during study hall, during home room, and for an hour or two at home when I was attending high school. It was a random drawing that I came up with. It took me a week to make it. As I was sketching it in pencil, I went back and inked over it as I went further with the drawing so I wouldn't smudge the pencil.
Just for a some info: I started drawing the robot's arm and worked from there. I had no idea what it was really going to look like in the beginning. I just kept drawing different designs and shapes wherever I saw it needed to be for about the left half of this image. I had an idea by then what I wanted the rest of the robot to look like. I drew the tail last.