Kimmi & Luna: thanks i'm glad you like it! ^_^ i'm actually pretty happy with how it turned out too...
Kling: lol...that's fine... ^_^ and dido! >_<
well, as far as making your figures less stiff i recomend just sitting around and observing people for a little while. or even just paying attention to the little things that you do...observation is always a key part to being able to draw something well...also, it's always a good idea to use refferences. whether it's photos, just people around or just you moving into the position that you're drawing, that's up to you, but refferences are the best source to observe how the body moves/rests. normally what i do is set the 10 second timer on my camera then take a reference photo of myself to get the general idea of a pose...(for instance, i took a reference photo of myself for the last pic i posted (though i am not in that good a shape, so i definately took some *ahem* "artistic lenience"...) and another photo of my hand to pose for Vaeru's hand...) it normally turns out better when i can ask a freind to pose for me just because i can get the exact angle and such that i want...lol...
also, as helpful as a reference picture is, it's sometimes not available, so i will also make do by playing with the angles, perspectives and zooms that i'm drawing a figure with/from while utilizing things i have already learned from previous experiences. for instance, keeping in mind that when people are sitting, they don't tend to stay up straight (they tend to sag/hunch over a little) while conversely, when standing they tend to be up straighter, but their hip will sometimes be cocked because normally, one holds most of their weight on one foot, then shifts it to the other, this causes the body to bend in a different manner as well so that it can maintain balance. and if you take these ideas and combine them with a perspective so that you can kind of hide your weaknesses, it helps it seem like you know what you're doing...lol...you could also try drawing non-static poses and that may help you figure out how to make the body move/seem like it's moving in a natural way.
i know i'm not one to talk (especially since i still have a lot to learn/improve upon), but i think that observation and copying is kinda key to gaining an understanding of any one form. once you have a general idea of the rules that apply, you can get away from the copying and create pieces that still look/feel natural, but aren't taken from any reality. even within my portfolio, you can definately tell which images i have or haven't used a ref. for... (honestly, i started out by copying my brother/grandfather while growing up, then once anime started getting popular, i would re-draw images from DBZ, Saikano, Miyazaki, and others which really helped me learn some things about posing/the basics (i can still do a fairly decent hand in a particular pose that i learned from the pic of Goku from Saikano that i did...lol...) i also found the tutorials from
polykarbon.com to be really useful too...)
anyway, sorry for making this post much longer than necessary, but i hope that helped at least a little... ^_^'