Metal in a high quantity can be extremely hard to draw without making your image look very gawdy, and I think that you really managed to pull their costumes off well. Both of them look similar and yet unique and separate. I love the awy that you almost inversed their outfits. Her calves are blue, his silver. Her thighs are silver, his blue.

I also really love the differences in their pose. Her forward, him to the side. Again, it helps to define them as individuals and yet they're obviously united. The deatils on the armor and the stripes on the shirt are really wonderful, giving it an authentic look.

The only thing I'd add would be a second foot for the man. Even if they were close together, a bit of an outline or darker sillhouette would help a lot. Overall great job!