Here are my thoughts.
1. All units in the Elven castles are top-notch, both in the Dark and Light factions. In the former, all the human units – especially the female ones – are very well-drawn. Therefore, I give the Dark faction 10 points for them, but the animal units in this castle don't please me – like the hydras, dragons, etc.
Yes, the female units are the best of all female units :)
As for the dragons, I personally don't like their models in the game at all. They don't look like dragons, but rather like overgrown snakes. Compare, for example, the imposing gait of a cyclops (and its size, by the way) and a dragon that flies with difficulty (they all seem to fly with difficulty) and drags its tail along the ground (the green one, I think). Compare the bone dragon in the third game and the ephemeral one here, which seems like you could "poke it with a finger and it would crumble" (which is actually the case in practice).
And another important detail – in the third game, all dragons moved on their hind legs, which made them look very majestic, because bipedalism is a characteristic of higher beings, not animals (and the hydras were already made to move on four legs). But here, they have all lowered themselves to four legs, becoming closer to animals and losing all their majesty