All of the color choices could not have been picked better. The subtle warm tones in the skin and that extra highlighting light refracting onto and from her chest.
The extra sharp sheen of the metal make the image pop, especially from afar - even within the thumbnail, and the details here and the tinier details here and there, such as the skeletal forearm and hand, the cutout in her top, the tiny but contrasting hairpiece, the subtle but popping symbol on her forehead. And the extra detail of the broken halo is a nice added touch for the theme of the drawing.
Overall, simplistic but really gets the point across, and oh m a n do I love the vibe I draw from this painting. I could stare at it for ages, honestly too.
Just spectacular creation!
I look forward to browsing the other many amazing pieces of your gallery - Although I have a feeling this one might remain one of my favorites.