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You made this tough, even if i like all the examples and explanations.
Tbh its too hard to pick one of these it would fall under preference to the individual / or / imaginative game this would work in.
I was a tank in the old wow days, a gnome tank at that, i thought it was funny this little stocky guy taking on all the baddies. (tank in wildstar also, same deal chua.)

If i went on that and on color 3rd one makes the most sense to me.(green environment) but atm my attention goes to the middle one, element choice is 3rd one.

Otherwise cool.

So i just had a quick 5 minute thought about this as a whole and wanted to share with you what i thought might look neat, its based on the 3rd one in the thumbnails above this post.
You stuff with slight alteration on view angle
^So that but at a different angle than the 3rd one ( C ) posted above.

You can of course do what you want i am just throwing ideas out here. (for me it took a while, i thought that was her back viewing the camera on the img i linked, then i saw she was bending over)

I like her using the element and her sticking to the wall, everything going on in the img i link i like except it taking a while to figure out how she was standing (could be a me, problem.)

The A is really cool, there's a lot of feeling and story, but if you don't know there's a mask in the story it become very confused.
The B is probably my choice for the moment, it could be interesting if she has kind of a dialogue with the mask like he is proud of her or something like that.
The C could be really nice but I feel like the big arm cover too much of her body and the whole composition is jumping to the right. I could be (my guess) better if make her left arm the stone one like on your base design.

Aynway I love the way your illustration is going, keep it up !

It's looking really good! She remind me of KaiSa from Leauge of legends. I really like the angle of the camera in your illustration! Great work!

Nice, realy appealing face and expression!

Looks cool and dynamic!