I agree with the metals being superb, but I must add that your subtle variances in the blue shades (especially Wonder Babe #2) are quite impressive.
I checked out the original piece in B&W, and saw that a couple others had done a fine job colorizing this fantastic drawing.
But in the other two, there was very little blue, which I think overemphasizes the metallic pieces, and drew my eyes away from the character faces.
Just my opinion, of course, and those others were fine works, too...
But your version actually drew my eyes across the whole piece, and let them settle on the uniqueness of the individual faces.
I think this adds greatly to the original drawing, by pointing out just how much effort was put in to making each character unique, yet maintaining the Amazonian Strength.
So, in other words, I like it! A Lot!
I think you did a great job coloring and definitely did justice by this drawing!