Posts from RTF is a global modification that replaces all towns in the game. Auto-translated

lizards, version one, I think I'll rename the gnoll berserker to something else (raider or rogue would be fine), and call the lizard upgrade a berserker.

They look good, but I think the helmet doesn't really fit the upgrade. It's too bulky.

Added 1 minute ago
Something in the Aztec style would suit them. For example, like the mask of the Snow Lords. (from Heroes 6)

The lizards are cool, but the green one's tail is kind of strange. Regarding lizards in the jungle, for example, in the WoW universe, they are mainly blue-green, purple, and rarely orange, while those in the desert are red, and in winter locations, they are brown-green, although there they are animals, and here they are more like humanoids.

I can't extract models from Heroes VI yet.

the dragon helmet is indeed quite large; you could reduce its size, but it might not look good...

I think if you remove the lower jaw and the green eyes from the helmet, it will look better. Or make something else out of this helmet. A shoulder pad, for example.

I think if you remove the lower jaw and the green eyes from the helmet, it will look better. Or turn this helmet into something else. A shoulder pad, for example.

I looked at the heroes' skills and believe that a library is absolutely necessary for merging (half of the heroes initially have water and fire, while their main magic schools are earth and air). And it wouldn't hurt the Dark Gnomes either (they have a 10% chance to learn each school of magic).

Very strange distribution.
Phantom, regeneration, blessing, dispel magic - fire?
Scatter, slow, enthrall - water?
Wall of swords - air?
Vengeance, beam, mines - earth?

I recommend remembering the spell distribution from Heroes 3.

Phantom, regeneration, blessing, dispel - fire?