Meh I geuss it is okay for yours first try...
The outline of the hair is too dark, makes it look like the hair is a wig maybe...
The legs look too straight and plain, some shading is needed there to add teh effect of knees...
In the batller the girls drees is longer, not a mini skirt but its below the knees can blame you though coz your sprite doesnt have knees...
The Dress IS black, but the sprite version is too dark, it needs a bit lighter colour, maybe a dark grey so you can add some detail to make it look more defined...
the bow on the top row of the sprites is good, its like the right size and shape, but it looks like you got lazy on the other rows as it looks like a basic bow, keep the consistancy up throughout the sprite...
I cannot see hands on the sprite, make sure the skin colour is clearly defined, it may be too light...
Final and most important...
Make the backround one colour, I know its probably like that coz of the format you saved it as, be careful about that coz it just adds more work to spriting...
WOW that was a big comment from me, sorry bout it being soo negative I was just giving advice though...
But keep trying, after a bit more practice you could definatly improve
Well thats my Resource comments over for another 3 months maybe.