Good point, I kinda get carried away focusing on portraits and forget that they're supposed to represent a specific character design at times, so like in this case I didn't realize including the horns is kinda necessary as they're one of the identifying factors of the character. I should probably scale it down a bit and make a "zoomed out" version, although it's not a great work flow to patch surrounding area in..
Wonderful icon! Clear, well made, great quality and recognizable. Perhaps agree a bit with Scias that the horns could have been a good addition but as they are quite big the icon itself would have had to be made completely differently.