This started as a doodle essentially, and that's what I treated it as when I was doing it. I began with no concept of what I wanted to draw, what it would look like, and a total disregard for composition. I began with the eye, and worked out from there, I just put shading in where ever I felt like it, and gradually it began to turn into something. I did not worry or do anything about composition until I was putting in the background.
This was done from start to finish in Photoshop, with a wacom tablet and took somewhere between one and two hours (I was just playing around with Photoshop when I did this).