You're free to offer what you wish. 

Everything in this folder is semi-tentative, and stuff might move in there from my Toyhou.se account and back on a whim, depending on my needs in characters at the time.

Easy - Will trade for a chibi, a bust, or a sketchy full-body reference. 

Medium - Will trade for another full-body reference with clean art. Anatomy can be stylised but must be clean (lineart + colors don't go over the lines + shadows are a bonus but not a must.)

Hard - Will trade for a high-quality character with a full-body reference, or a character with several clean artworks in their gallery.