Actually I spent more time on the bike than I should have. It's probably detracting a bit from the focus on the girl in the foreground, and there are still a couple of minor drawing errors, like the front suspension of the bike. In the full-sized version of the drawing the rear suspension is also a bit screwy.
When I designed her I was thinking black hair, ice/water-themed colours (I must've failed this), Ainu design similar to Nakoruru, or the characters in Utawarerumono. That was how I came up with the topic name Ainu In Space--it was derived from a joke someone on an IRC channel made. Some people actually imagined her wearing red rather than blue, etc., and I think somebody even suggested multiple colour schemes like Ganguro.
