The white part is really confusing, it doesn't look like feathers to me. Make them have a better texture on them instead of just a white area, looking like this possibly. Also, im also kinda confused as to what the object is in the middle if its a sword or a guardian itself.

The wings aren't just white, they are cloudy, like fur. I didn't want to make them like feathers because the model in-game doesn't look like feathers either. I can add more texture to it though, but I don't want them to be feathers.

The part at the center is the armor. I wanted to add a sword, but it got too much for the icon, so I ditched that part.

Its wings doesnt look like standard ones bro, i looks like a white background :l

Updated icon. Added more texture to the wings and removed the spike coming from the chest up towards the helmet.

I like what you did with the wings. Looks way better!

This needs a lot of proper shading, especially on his chest armor.
A proper light source is important, where is the light coming from? Shadows are missing.
Avoid using plain black lines, use darker color of the object to shade instead.
Search for tutorials and references to have a better idea.

Updated. The light is supposed to be in front of it. Yes, it was missing some shadows, especially on the wings.

I also re-did the helmet and removed some details, because they, although looking good in 128 and png, turned out very messy in-game

Helmet looks fine, his "horn" on the back could be darker.
His breastplate still need more work, as they lack of proper shading and is looking flat, I suggest you to design and structure the shape properly.
Even if the light is from front, many part of his body should still be darker, leaving only highlights to few external spot, this way it will have more depth and provide a good focus point to the icon.
Also remember to do transition properly, you did them well on the helmet but ignored the breastplate.

I did some rough paintover, obviously the armor doesn't fit but I hope it'll give you a better idea in some way. Take your time.

Improved shadows on chest. I want to keep the shape as it is.

The way it reflect light still seems off but the flatness has been fixed. Wing could also benefit from more accurate shading but it's a minor issue.
Nice improvement, good job.

The icon is good, but there is no corresponding model!!!