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And how will you draw the units? In Paint or Photoshop?
There are many nuances in their creation, and it's very difficult...
You can edit a couple of demons in Photoshop, adding blue color...
Okay, I wish you good luck, but I warn you - don't overdo it!
By the way, if you choose Necropolis, don't just add snow, but also make the tone brighter, it's better if it's daytime there... or let it be a polar night... GOOD LUCK)))