Interesting concept )

This is a really cool piece! If I didn't know better, as you said it was an old charecter that you've redrawn, I'd say this is the mix of Mercy from Overwatch if mixed with Itchigo in from Bleach when he becomes "evil". However, you've clearly made it your own and I love the design of her armor, the poseand the artstyle. The artstyle almost feels animeish with the armor, but the paiting style seems western and the two meet perfectly in the image.

I also love how there is movement in the image as it almost looks like she just swished her left arm backwards pulling the cloud infront of her! Super difficult to make smoke/clouds move naturally without just looking like smudges, but you've pulled it off. Might not have been intentional, but I still think it's great.

The colorpalette is also nice and the sense of depth is emense! Really nice.

My only quirks with the image are that her upper torso seems a bit thinn or something? Some minor prooportion thing that bugs me but I can't quite put my finger on it. Could also be the red armour assessory that does it. It should be on her stomach i guess, but it disappears neatly around her stomach on her right side, should have been raised a bit as it goes around the edge I think? I also think the shadows are a bit uneven in places, i.e. too dark in some places and light in others where they should have been equally dark (motivation for 4.5/5). Some examples are on the right side of her neck that seems too dark, same above the breast on her left side, where is that shadow coming from since the light is coming from the right. Small twirks like that

Regardless though, I am nitpicking and trying to come up with things to comment! Overall the image is great and I wish there was a quick way to see the old one to see how you've improved :) Great work.

This looks sooooo great!!! I wish i could draw like that!! I really like the hands and hair.