I did this in 2010. My first edge loop modeling project. I collected every picture I could find of the false Maria from the movie "Metropolis" and even downloaded the movie and took screen shots for the references. I worked on this for a month. It was completely modeled, rigged and rendered in Blender. I made the armor material based on personal testimonials i found from 1929 that it was a bronze and not a silver color.
I had all kinds of plans for the model including improving the face a bit. Recently, I would have loved to have entered this in a Blender Guru Sci-Fi competition but I lost the Blender file to a hard drive crash in 2011. Only this low res copy exist. Which makes me very sad...and angry. lol
