Hmmm....
This needs work...I use the same sprites so if you need to see someone else with better animation then check me out (only helping). You first off need a background just so it will look better when they fight, then you need to cut the sprites out better (seen the background still on some of the poses).
Get more variety of sound effects, if you need some then PM me and I'll get to you :). Try better to place the sprites behind each other so the animation will look smoother...also get some music so you can set a battle mood.
There's more stuff to be done but this is basically the basics, if you do this then I guarantee you a higher score ;).