I think I like our avatar more form the 'Our little spirit' version, since it appears to be more agile and more positive than the newest one from 'a few sketches of the the slave and the avatar' - this one, with the belly sticking out, looks like a child (that was probably the intention ;) which maybe makes him clumsy and a bit creepy and the same time, don't you think?
But I do like your slaves design - especially those three fingers being directly extension of the big forearms, like in 'sketches of the slave race' on the right and also your newest drawings :)
Oh, and I like light and colors in your newest drawing as well :)