So here is current list of buildings if their images will be changed the game will benefit greatly:
Remade:
Human barracks (looks like hangar, not like barracks)
Inspiration:




Human dock (what is that hut on posts?)
Human castle:
Inspiration:


Maybe human stables:
Inspiration:

Dwarven barracks
Dwarven shooting stand
Dwarven tavern
Dwarven craftsman's guild
Dwarven bridge
Dwarven tunnel
Revamp into new building type:
Human mage hut (revamp into mage tower):
Inspiration:



Some polishing and some updates:
Orcish Volcano (needs some love, also weird to see green volcano or white volcano)
Orcish stone shelter (tower one, needs some love)
Crypt (needs some love, as for me too 2d-ish)
Great tree:
Great tree itself can be kept as it is; i am asking for some city-like decorstions around it.
Inspiration:


3d View video of Sylvan city in HOMM 5
Any image makers are welcome to try!