Ok let see.... (What can I know only from looking at screenshots)
Blizzard cliffs
Low or not at all custom models (imported or so...)
Very small number of doodads
Very low stuff about plague
Dead things nearly none
Lightning and weather effects
But I must say that fog is good
(Red sucks honestly try, white, gray, black, brown or dark green, dark teal for dead lands, also make it start from 0)
But hey just try harder and you will make it, use large number of resources from this site, learn, upgrade skill, one day you will have awesome terrains