Hero glow could be brighter, since I think it's not that visible, not that bright. I have a struggle with "Hero Glow Square" when making icons too sometimes.
Or changing from the light blue/teal color to something else when making "Hero Glow Square". Iron Fist Leader Gardon Bloodclaw's icon has red hero glow on it.
By the way, suberb quality icons you have! Well done. (Not just these, but overall)