Beautiful character avatar.

 Thanks for the tips! I started this one just to get a feel for pixel art, I'll try to play around with it some more using your suggestions! 

 I like the style and helmet wings a lot. Her eyes are very intense! It reminds me of portraits in older games. I don't know if it's a palette limitation or not, but the reds and greys are all the same hues, which makes the lighting feel flatter and less realistic - in real life shadows and light aren't all the same hue, you get reddish shadows sometimes looking almost purple or pink etc due to things like color temperature. The reds are all very similar in saturation as well. It's common for shadows to be 'cooler' - less vivid hue (they tend towards bluish colors), less saturated. Of course, there's always exceptions, but yeah. I would look at pictures of armor and try to find some pixel art from a game or artist you like that includes armor to observe their palettes for study.

The middle shade of the helmet silver is a little too dark compared to the brightest shade, too, I think. Just a few suggestions