Necr1s: In the original version of the game, all enemies had different sprites for their subclasses. For example the crusaders had green/blue/red symbols on the coat. Now the enemies can be tinted, but it does not feel like the original game (and a complete purple Skeleton Lord just looks rediculous). Even with the tinted option on, some enemies are coloured the same, like the Wraiths and Wights, while in the original game they could be clearly separated.
Is it possible to add them again?
Run the Setup program and change hardware acceleration to software in graphics.
According to
https://www.gog.com/forum/might_and_magic_series/mm7_sprite_colors "Direct3D never had color differentiation in mob sprites."
In my case, Direct 3D did produce different colours if tinting was enabled (though only in the game screen; their icons when right-clicking looked all same). In software mode, mosters looked different in game and on icons, but it was a different kind of difference.
e.g. dragonfly
_hardware, no tinting: all look same in game and in icons.
_hardware, tinting: icons same, in game, the queen has a purplish colour while fire dragonfly is orangish.
_software: in game and in icons: queen, fire, and normal dragonfly have different mane colours, while their bodies are more or less same.