As I understand it, these are future head textures, not hero portraits in the menu, so the cartoonish style makes sense to make the heads and their facial features more visible.
I only have one question: why did the neural network draw Dugald and Axel as women?

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