It's a lil' weird, the way he kicks, looks like he's breaking the leg
but the rest is fine

Couple of tips - I'll try to be brief: Usually when I sit down to do a new animation, first I grab a piece of paper and sketch out the key frames. (If you don't know about key frames, you should look up some animation tutorials online - I believe this site has some in the links section) Once I have some key frames that look right, I'll use those as a guide when I actually pixel the animation. Another helpful tip when you're animating; just make the shapes or outlines and stick with that until it looks perfect - then go in and add shading and detail. A big part of it is knowing when to re-use the sprite from the previous frame and when to start a new one. With a drastic animation like kicking, you'll probably have to redraw the entire sprite for every frame if you want to get a dynamic, energetic effect. Ideally you should have a program like Graphicsgale that allows you to to view the animation in "onion skin", but it's not necessary, just makes it a little easier.

u r all right  , thx for C&C ^^

@ ben2theedge : i tryed to do what u said( not exactly course) when drawing it but both lack of skill and patience beat me ><

only thing i see wrong is the fact that he only turns so we see his side not see his back, as it is id say he/she looks like kicking Napoleon Dynamite... strange funny idea with the fierey leg... its good for an animation - i am too afraid of trying one... zAk

Not bad for a first try. To make a better one, here is what I suggest: Take a look at how real martial artists kick or look at King of Fighters or Street Fighter animations; If he's kicking with his right foot, all his weight has to shift onto his left foot, he has to turn almost 180 degrees so we can see his back, and he'll have to lean backwards in order to balance. It's very difficult to kick and keep your back perfectly straight like that, unless you're kicking straight up into the air like Trinity does ;^)