I think that, when working with tint, I need to draw backgrounds and foregrounds separately. That way I can turn the foreground characters one color (in this case, blue) and keep the background objects their normal color.

Also, look at this blog full of amazing science fiction and fantasy art: http://dwdesign.tumblr.com/

Occasionally I come across an artist whose work–this stuff is strongly Moebius-inspired, but it stands on its own–makes me say, “yes, I want to do stuff like that.” And I need to remember to link to those artists!