Very nice. Highlighting with paints is really worth the effort.
The pics are indeed a bit dark - that adds to the "tanning" of your Natives, which doesn't seem that strong on the first pictures. From what I can tell, historical accuracy is fine. Personally, after seeing some reenactors lately, I would definetely go for extensive war painting. That looks just awesome. Here's what I mean:

These chaps also told me that Woodland Indians used a lot of red, brown, yellow and black dyes for their clothing, whereas green and blue only occasionally since it was limited to trading with the Europeans.
Apart from that, what about adding some brushwood and leaves to the bases? Dried parsley works very well, especially for 'autumn-themed' bases. Feel free to take a look at my versions (not the best of all photographers myself):
LINKAnyway, looking forward to your next miniatures. FIW is such a cool project.
