Auto-translated
1) Skeletons are quite standard; I have nothing to say about them.
2) I like the zombies; they are chubby, with an axe, and quite distinctive, even if not overly original.
3) The ghosts are excellently done, in my opinion. I like how they are depicted as criminals, and how each squad has three of them.
4) Making vampires dark warriors is great. The concept of blood-drinking maniacs only suits horror movies like Dracula, but not a strategy game where warriors should fight, not eat each other. In this regard, I think the fifth game made a real breakthrough.
5) The liches are not bad. The cloak is probably too extravagant, but the effect of the staff and magic book appearing is impressive.
6) No comment; I completely agree with Adagio on this.
7) Well, it could be better, in my opinion, especially the large head is a bit off-putting. The other dragons look more harmonious overall.