RTF is a global modification that replaces all towns in the game.

this is the black stripe between the hands; I removed it, and the black thing disappeared.

I quickly glanced at the birds and genies. It turned out great! The only thing is that the Void Genies look too simple (in terms of retexturing). You should slightly adjust their model. Repaint the gold ornaments in a different color or make them brighter. You can add bright, light patterns (magic, etc.) so that they don't look so boring.

I have two suggestions:
1) Make links to the finished units in the project header. Or in the faction description. For now, I only found the birds, gnolls, and genies. If there were other test units, I would like to see them. And it would be better to store them in one place for easier searching.
2) I had an idea to create not a global mod that replaces factions, but a bunch of small mods that replace individual units. This will allow the player to more easily customize the gameplay and faction to their liking. For example: I don't like the zombies and undead in the undead faction, so I replaced them with Mummies and Black Knights. Let there be alternative units for all levels. This will result in a complete faction replacement, with the ability to keep your favorite units. (I hope I described the idea clearly)