Okay, woah. This is the single most demanding drawing I've done since... uh... well, a very long time indeed, college perhaps. The lineart is a few weeks old already, and it took me a good two or three hours, and the colouring three hours as well---but that's counting the time wasted on giving my new kitten some attention. He also kept attacking my wacom pen. Le sigh.
Although there are some pretty obvious perspective errors, I like it a lot. You'll have to consider that mechas aren't really my type of stuff... drawing a robot was almost suicide (that, and guns and cars. I can't draw technical stuff to save my life). The robot itself ended up good enough, even if it looks perhaps a bit too much like the Iron Giant, but I guess that couldn't be helped, with what's going on in the picture.
My stupid favourite part of the drawing is the girl's butt. Don't ask. It just looks awesome.
I'm still trying to get a hang of OpenCanvas... it's hard.