It's missing a classic azure dragon!
Attached are my versions of the azure, emerald, and gold dragons for the MOD "Heroes 5.5 WarGame Edition - Tactical Edition" by esteemed comrade Nargott!
But it would be nice to have a couple of screenshots from the game.
It's hard to judge:

The green one looks interesting; the eye is certainly drawn to a certain blurriness, but it's still more atmospheric than the original green.

The icons look good =)
It seems that the originals don't have a black outline, which is why they look worse.
If you give permission, I might create a neutral Azure unit, based on the textures of the blue dragon.