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Yes, I think the cartoonish style is a plus here. In the sense that it looks like an improved version of an existing unit. The units from the fifth game were quite cartoonish. Might and Magic used to make them smaller, and they looked worse. The regular zombies had a rather large axe, so after that, a sword of normal size doesn't look that great anymore.
Khottabych also noticed that there's not enough armor. I think it would be good to add armor to the belt and one of the legs.
Regarding the color, I think it would be better to take the idea from Waterfall.
That is, all second-level upgrades have one color scheme, and all third-level upgrades have another. And if we're going to create a zombie branch parallel to the ghoul branch, then at the second level, they should be greenish, and at the third level, white with black armor. In the color scheme of the improved ghouls from the sixth game.
That's all. These are hypothetical thoughts about a mod that I probably won't make.
I kind of want to, but I'm trying not to spend time on it.