Welcome to the forums!
Onto the critique:
Some of your grays are much too similar! Make sure that every color you use is distinguishable at 100% zoom or it is wasted!
About the male and female forms:
In both, the arms are too wide relative to the legs. The key feature that should distinguish the female is her HIPS! Right now, they are seriously lacking. (Also, the long skirt is quite impractical for battle!) The shading needs work in general, but the first priority should be creating identifiable silhouettes. In regards to shading,
pick a light source and stick to it! Light is an extremely important tool for defining volumes. Places that are hit directly by light should be brightest, and those that are in any way blocked by light should be in shadow. For your characters I would suggest a front-overhead light source, rather than
straight on. A couple random notes: the helmets are very square. Also, bare hands? Seems gloves or gauntlets are in order.
I cannot provide an edit at the moment, but I'd love to once my finals week is over!
In the meantime, good work and I look forward to seeing your progress!