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 !
Hey 3dc, Thanks again for your answer and the time you've spent showing me what's not good!
For the (C) option, there is definitely something wrong with her and I totally agree with you, the pose is a lot better on the thumbnail than the composition. I'll probably not spend time to redo that one because I'm not a big fan of that direction anyway. It could be worth it of course but I'm more confident with the 3 others for now. Thanks again!