To know what the faces are called: Open Face_Defualt.zip in your add=ons folder. It has the files for all of the default faces.
To change the body color: I forgot the events exactly, but I think it goes something like this. Change the body decal the same way.
OnBotTouch > bot > EditBotAppearece > UnhideNode (pick color here)
As far as I know, the bot events can't edit the face color for some reason.