This is definitely going to be the toughest, but probably the most accurate and thorough fashion sets of mines.
I can't wait to see when all the blanks are filled. Your work is amazing really bringing to life pre-columbian Mesoamerica. I love how you include people representing the whole of native societies rather then just military or royal figures like most works do.
Yay!! I've been looking forward to see this coming! (though i'ts obviously not finished yet )
More huipils? For me it looks like you've got enough of the kind already, but what do I know... anyway I think you definitely should add some deities, just a few maybe since if I remember right, that was also what you did with the Postclassic Maya one.
Do I have any suggestions? Well I don't know if you already have planned drawing him, but the Tlatoani? And a healer of some sort... the Cihuacoatl or a provencial governor and perhaps some ceremonial dancers or even a ballplayer? There you've got your suggestions. I'm sure I have more, but I can't remember anything right now.