Yep, she's pretty much exactly symmetrical... I basically just copied and pasted the line art. It was a rush job, but when I have time i definitely want to go back in and change some things. The bodies in particular need work, as I was working from a set palette and wasn't really able to properly shade them.
The one on the right seems to have a bit stiff pose. Probably because she is drawn a bit too symmetrical. Try making her look a bit less symmetrical by changing the pose a bit.
They look pretty good, but for some reason this has 64 colors and it looks very close to the exact same with only about 30 colors. Working with a smaller palette can be a little challenging, but a lot can be done with very good results. :)
The extra colors come from the helmets; I essentially just put colored bubbles on their heads and lowered the opacity on them.