Well, here's how I see it:
1. Demon - the armor and weapon are well-chosen, and the skull bracelet is cool.
2. Necromancer - a beautiful, mystical image - a hood, a robe with a skull on the shoulder, and a scythe with skulls symbolizes fear.
3. Knight - the classic image of a European knight never gets old.
4. Barbarian - a fierce, mighty, and warlike warrior in the style of Genghis Khan.
5. Warlock - a mystic who lives underground - the horse really doesn't fit the theme.
6. Wizard - it doesn't look very good: all the heroes are tense, fighting on the battlefield, and this one is sitting in a soft chair, smoking a hookah, and drawing spirals in the air.
7. Ranger - the deer-head helmet doesn't look good.
8. Rune Priest - an ugly helmet and weapon, and I won't even mention the horse.