SPLITTING POST DUE TO 30 IMAGE LIMIT.
Rocky/Cracked
Not sure what to do about the rocky mountains that come with this climate. They look cool so it would be nice to get them in the game but I'm not sure the best way to go about it. For now I'll just focus on the cracked terrain.
Resource 1 - Crystals

(Click to enlarge, NOT pre-converted to civ2 palette until we decide on best conversion colour)
Resource 2 - Oil
Take from above pic.
Bonus Decoration
Witches hut, or Troll bridge
or
Sandy Desert
Resource 1 - Oasis
(just replace civ 2's desert oasis haha easy)
Resource 2 - Gems

(Click to enlarge, NOT pre-converted to civ2 palette until we decide on best conversion colour)
Bonus Decoration
Sphinx, or Pyramid, or City of the Damned
or
or
Dirt/Plains
Resource 1 - Windmill
Resource 2 - The Arena
Bonus Decoration
Earth Elemental Magic (could be used as a resource), or Gazebo, or Standing Stones
or
or
Snow
Resource 1 - Mercury Lab
(I love how there's a special snow version of it so we gotta use that haha)

(Click to enlarge, also pre-converted to civ2 palette)
Resource 2 - Obelisk
Take special snow version from above pic.
Bonus Decoration
Water Elemental Magic (could be used as a resource), or Lean To, or Frozen Lake (above pic)
or
Coasts/Beach
What you did before was good although it'll need dithering otherwise it looks weird next to the other terrains.
There is an actual beach terrain/climate zone in HoMM2 but its got no special/unique buildings and I'd rather save the slots it takes for other cool sh*t. We can see enough beach in the cool coastal terrain you made last time anyway haha.
Roads
Maybe make them fatter to have more of a HoMM2 look and as a fun extra maybe put little horse stable next to the road in one of the road junction graphic tiles for wow factor.
Rivers
I liked the ones you used last time. Maybe like with the roads insert a lovely waterwheel on one of the junction tiles for wow factor.
Railroads
Rename to
Enhanced Roads using a shiny/sparkling golden version of regular road textures like in master of magic. Unless you're planning on blocking railroad tech and substituting their tiles for something else cool.
Irrigation
I've got something in mind for this.. just need to find it in my files. I'll also check the ones you gave me to see if there's anything better.
Farmland
Use a converted copy of the nice farmland tile in ToT midgard/fantasy scenario. I may play with its colours too.
Mines
Take one of the HoMM2 mines and remove the resource type and maybe have an empty train cart or something else to give it a generic look.
Fortress
Not sure yet. Maybe use the H2 fort but make some adjustments so it doesn't hide all the unit.
Airbase
Will need something for those flying units you've allocated in the units file. There's no eagles nest in HoMM2 but we could make one pretty easily. Eg combing a mountain terrain with the eagles nest used in the sky world of the Midgard/Fantasy ToT scenario.
Village/Goodie Huts
I think what you previously did with Treasure chest works fine.