The site is run by Jon Morris and I think it is a pretty cool idea and I had to ask him to let me participate. There werent that many characters to choose from but I thought Mr Harker had a pretty interesting back story...weird but interesting.
You can see how I work sometimes on a character. I usually get busy with red or blue pretty rough, but I try to get most of the proportions correct. I rough in details and then look at images to see how the look in real life (such as the wheel chair and shotgun). From that point go in and lay in the pencil... and more pencil.