You know, what I really like first and foremost are the lighting and composition. Landscape character compositions are quite rare, and this makes your piece stand out. I do think the composition would've benefited more if you played it a bit by the rule of thirds, but it's awesome nonetheless.
I also really appreciate the way you showed that flesh behaves like...well, flesh, regarding the arm. So many times I see artists drawing bands and such that are tight around the skin, but not showing that the skin gets pressed and compressed by it. You have an eye or detail!
Now, to my critique-worthy observations, adn not ass kissing
First, if the armour is metal, you need brighter, more contrastant reflections, especially given your lighting. Reflections on metal are very bright and sharp under normal light cnditions, let alone what you showed here. Here are a few reference pics to show what I mean: www.ageofarmour.com/images/sig… www.ageofarmour.com/instock/go…
As you can see in the pics, the highlights are strong, sharp and white (yours should be a very light blue, ofc, since your main light is blue-ish). Your armour looks a bit more matte, and not as reflective. The piece of armour you did the best job on is her shin guard, where the highlights are sharp, and if you'd manage to do the same thing for the rest of the armour, it would look awesome.
The movement of the character suggest that she is going towards the right, however her hair suggest left-towards movement. I feel that by making her hair drag behind her you'd have a much more dynamic picture.
I feel it's a bit upsetting to the eye that you cropped her finger. By extending the canvas with only one cm you'd avoid cropping her finger, for better visual impact. It's a good idea not to crop at the joints if you have to (finger joint, elbow, wrist etc), but rather at the middle of the limb, making the cropping look more deliberate and visually harmonious.
I feel that stronger shadows would fit your piece and its lighting more, though that might be just my personal preference for dramatic contrasts.
Otherwise, I really like your approach to her pose, which works well with the composition and is rather dynamic. The colour choices are also really well-done. Hope this helped!