What does it look like in the game? I'm not working with models yet – first, I'll plan all the creatures and abilities, assigning them numbers, then I'll create placeholders in the game without models, test how it works, and only then will I create models for the creatures and buildings. Using a conveyor belt method.
This isn't just a colored texture – it's a black background with a white outline of the body, divided into many triangles!
Attached are the Naga creature in NCF format + three meshes: a demon with gauntlets (as you called it), and a lizardman archer (the main body and its accessories)!

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Неудачное планирование ведёт к неудаче ...
NCF - мод, добавляющий дополнительных существ в HeroesV 3.1