>>20452179AFAIK there really isn't a tutorial for trainer sprites.
Some things I've observed from doing them though:
Eyes are generally about 2-3 pixels tall and 2 pixels wide.
Adults are roughly about 5 heads tall.
Necks are thin and most of the time not even visible
Other than that, they follow the same rules as pokemon sprites.
Here's a bunch of great general spriting tutorials.
http://www.pixeljoint.com/forum/forum_posts.asp?TID=5692And posted is a small guide for tiles. It's not very robust but it definitely helps.
