Great job!
What I didn't like (it's a minor thing, but) is the backgrounds of the icons. The default ones have artistic backgrounds from the mod, but the new ones don't!
Also, in my opinion, I've never seen the point in having too many different creatures/heroes. You'll never encounter them all, and the balance will be annoying xD
It would be very good to use this in Heroes 8 later, if there will be one, of course.
2) Many neutral creatures can be hired in buildings - see the last screenshot, and random armies are also generated (all creatures are used) - see the first screenshot (you can encounter them all).