I think the coldness is primarily due to me habitually making shadows bluish, as if they were outside under a blue sky (and also because i forget to shift the bright spots towards yellow for the sunligt). In all honesty though, i need to study colours more, i don't know an awful lot of colour theory. :I

Also, regarding pressure sensitivity, i'm not comfortable with that yet. I can see it being useful, but at the moment, i want to get comfortable with fixed opacities first, so i don't have to worry about how hard i'm pressing down with the pen (which, mind you, behaves a bit erratically on this tablet). I'll get to it at some point though, having to adjust the opacity manually is a bit of a pain sometimes.

@WorldEater: Thanks man! If you don't mind me saying, i am personally pretty pleased with how the duck turned out, if you look away from the lack of contrast and detail on the beak and chest. But hey, made it for fun. :U