RTF is a global modification that replaces all towns in the game.

for example, Wintral, but the abyss beneath him will have to be removed

Never mind. That snowy pit looked silly anyway :)

good sign, just make the wings black, and let the sword be a color indicator

Good idea :) I like it.

Added 22 minutes ago
The icons for the Lizardmen were taken from Heroes 3 and don't look very good next to the other hero portraits, so I decided to take the portraits from King's Bounty.