From Overall photos of Hrist cosplay you made here, this one show her armor best. nice lighting too... maybe do the skin tone changes like how you did on Lulu too and this will be looks better since Hrist have pale skin.
but from the detail of armor itself...
It is too bad that you ignored the small details like feathers and some white spots on armor that made your armor looks kind of fragile and still paper-like especially with white spots on it.
I believe you don't have any trouble with getting materials or spending some time on your costume, but perhaps, you wanted to try again to create better details on armors later on. here is someone who are able to deliver armor details nicely, [link] ... don't need to make is rusted but at least some textures details will make your armor looks awesome. then for the gems, i believe you also able to add detail like [link] ... i think there's enough space on shoulder.
hehe...my teacher often tells me "why should make only so-so quality if you can make great quality...?"