I'm thinking either one missing section (the last one and again, the breaking point should not be clean at all) or some sort of scratch that goes along the hand, making an opening in the armour, not actually breaking it off.
The way she is posed right now, if you removed the armour of the whole hand it'll look like she did it herself and that would make even less sense. xD
~I tried looking up broken armour but the closest I could find is a pretty damaged Iron Man mask that illustrates my point about not having a clean edge very well.~ Then again, it's up to you.
Stream site https://picarto.tv/Fris
This is a really cool idea and I like the progress of it. One thing I have noticed is with the mask, its white and bright purple vs. the other color scheme. My eyes keep wanting to focus on the mask because its soo bright compared to the rest of the costume. Maybe add some white or purple for the rest of the outfit to help lead the eye away?? other than that I am looking forward to seeing more progress