Where's Wall-E?

So I got myself a rake of bristol board recently and, being unsure what exactly to do with it, did a little experiment in pen and watercolour. I took the image from something I was playing around with in my sketchbook. And since I was in an experimental mood, decided to paint only in one colour too. So I drew it lightly in pencil and went over in pen. Worked up the tones in watercolour, and finally, added some digital flourishes in Photoshop. Here's the result. Also included a few detailed shots too.