please don't blame me if this isn't the right place for a sprite how to. i am still new to this site. anyway, this is how to sprite an M.L.P. character or o.c. pony:
you may use the curve, line, and fill buttons. those are all that you need.
1. find the character you want to sprite.
2. use the colors from it to start spriting.
3. if you want a sprite sheet, then make different poses. if not then you have completed the steps.
this is a completed sprite: