I started to work with people who wanted to try their hand at making games, they needed characters, monsters, vehicles, weapons. I realized that it is much easier to draw a concept and then create a 3d model, so I started drawing again, this time digitally. It's more symbolic, just to capture idea, more for personal use than a real concept art.
You can find 3d model versions on Beyond Boulder Dome mod blog
in older posts and something on my web page