Keep the sprites coming....the more u do, the more u improve
Neways, make sure u save ur sprites as png or bmp and not jpg... and like logiedan said, use the official sprites as a reference. Try to match the outlining and shading in those sprites.
That said, I was gonna use some of the B&W sprites in my hack, so i'll post them here as i do them, starting with this:
the cheerleaders with some edits... I did them cuz they were cute XD... neways... feel free to use it as part of the resource, it's indexed and ready to insert
Good Luck.