You have made some amazing models. My favorites are the ones that match the civilization but are still very distinct from the other units in the set. You shouldnt have to look and see if the unit is holding an axe or a sword to figure out what kind of unit it is.
I see this issue in several sets in this forum, not just yours. In some it begins to look like a clone army with all matching heads, facial hair and similar (if not identical) clothes.
This set is probably my favorite of yours because you did such a good job of making each unit unique. But even in this set more variety of heads/hats/facial hair would be good. I especially love the red swordsman.
Again, I hoping the feedback is helpful, Im incredibly impressed with your work and excited to see more from you.