This is really beautiful. I'm not well-versed in the comics, so I don't know if you took the costume design directly from there - but I love it! And the muted colours, her quiet, serious expression and your art style come together very well.
I thought this was a photo at first, it looks THAT realistic and solid I like how you managed to work with the grey shades without making this looks too dull and colorless. You can almost feel the chill in this.