It's pretty good. You should probably make those gloves look more like gloves and not like the rest of his hand painted black. You might also be able to save a color if you use the dark purple in his clothing as the darkest color for the yellow. They're really close.
Mine:Yours:
Do you see much of a difference?
Very small difference, just a suggestion to save some colors.

Graphics Gale is step up from MSpaint and still allows you to use layers. You should probably take one of the soldiers and try to concentrate making one of them really nice.

I don't really like the dithering on his back. You didn't really need to dither.

I like the concept art of her butt...
The hair on the first versions was too close in hue and value I think, this is better on the later version.

I think the hair needs a little more contrast on the latest version.

RobG, why didn't you pixel her in that sweet two piece? And shouldn't her hair be trailing behind during that skidding animation?

I've been working on a game with my friend in Australia for a while called 4Heads. It was a silly idea that has received a good deal of support from other people. We only had a demo and we are now finishing the game. It should be out in a month.
A few people have been giving us crap about the cuteness of our games and how they lack any level of seriousness so we're planning on making a slightly serious game That means we'll try to avoid all those vibrant bright colors, use some more detail and have a slightly realistic "world". We've discussed making a more action oriented game that would still be in the same "world". Since it will involves more action we'll need some attack animations. I thought since these creatures don't have arms they'll have to smash with their heads or head butt other creatures. I made a quick animation and it turned out badly.
It should have named it flaccid.gif because it... looks flaccid.
Here's a good picture of what they look like:


I was never really good at animator and always avoided it (didn't help) so now I'm asking for some help from you.

Here are some of my sketches, smash animation was drawn out at the bottom right.