Here you go :) http://media.steampowered.com/apps/dota2/workshop/Dota2CharacterArtGuide.pdf http://media.steampowered.com/apps/dota2/workshop/Dota2CharacterTextureGuide.pdf
Creating assets for TF2 has supposedly become more intuitive; http://steamcommunity.com/workshop/browse http://steamcommunity.com/workshop/workshopsubmitinfo
After a year of learning 3d and working on this set at the same time, it's finally in the workshop! http://steamcommunity.com/workshop/filedetails/?id=450079968