I was surfing on mugen forums and i saw some good tutorials for sprites. I thought that it wud be good to share you some of them =3
1. To make cool shadding on clothing :

Very cool tutorial, this helped me a lot, i hope so for you. Tutorial By the big IEe

Source :
http://mugen-elysium.activoforo.com/tutoriales-ayuda-f8/quieres-crear-tu-propio-sprite-pues-entra-aqui-t21.htm2. To make nice hair :

Nice tuto, very good for beginners, and the result is nice ^^

Tutorial by the talented Ryudo

Source :
http://mugen-elysium.activoforo.com/tutoriales-ayuda-f8/quieres-crear-tu-propio-sprite-pues-entra-aqui-t21.htm3. To sprite base 0 !

Veery nice tuto, that resembles very much drawing, as you can see. By the famous Nachonal

Source :
http://gm.orgfree.com/phpBB2/viewtopic.php?t=2921Please if you know more, share us, but just don't forget to post the autor and the source page
