Seems like a PNG export issue to me.
Save the file as a .PSD file, open it in GIMP – then export it as a .PNG file – be sure to check all boxes when the pop-up box appears. Then add it to the hero folder you are working on.
The class name needs to match the class you are building, and be sure the new class name is in the atlas file.
Current class mods/variants:
Shadow-Dancer, Maiden, Paladin, Lord, Blackguard, Falconer, Apothecary, Huntress, Baron, Diablo Pack (Necromancer, Sorceress, Monk, Demon Hunter, Witch Doctor)
DOWNLOAD FROM: http://www.nexusmods.com/darkestdungeon/?
My personal Art work and Novels: www.stevenmouland.com