As far as I know, such sprites already exist. And you will find them if you look around the web. This Garnet sheet popped up as second result when I did a google search:
http://o0yoko0o.deviantart.com/art/Steven-Universe-Garnet-Spritesheet-545405430
The creator asks to be credited if someone uses their work. You might as well send them a personal message and ask for permission and offer revenue share. Maybe the artist has more Steven Universe sprites to offer that have already been created. Because to be very honest, most likely noone will make you several custom sprite sheets for free. Your chances are better to find existing ones and ask the creators for permission in return for revenue sharing.