The main thing is to make it based on the basic images, and then you can improve the visuals :)
You shouldn't overdo it with the animations either, because the Tormentor and the 488 Gream Reaper creatures are great, but they tend to crash the game, especially the latter...
I don't know anything about the 488, as I have nothing to do with this creature!
As for Tormentors, there was some kind of bug, as far as I remember, but it was fixed a long time ago... in any case, you need to use the Mega-Pack build from the first post of this thread, as it is very possible that the uncorrected version is on its page... I remember that I was going to create a reminder to update the information on my website, but I never got around to it...

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