Hell and vinegar, per your earlier request. I'll leave the many well-deserved compliments to the other commenters.
A nice exercise in perspective... I have a few nit-picks, though:
1. The shoulders in general don't work for me. The lady's arms don't look connected to her body. The gent's arms, on the other hand, are TOO connected - like large tails, rather than arms, due to the missing shoulder joint.
2. The gent's pose is... odd. I'm trying to imagine the circumstances that would have him half-squatting that way while holding the sword in that fashion. I realize it makes fitting everything into the composition easier, but it's still very strange.
3. I found 2. while trying to look for the lines of perspective. They're inconsistent. You should consider picking up some analyses of Renaissance art from the library - they often have very good discussions on how to obtain proper perspective in a complicated composition like yours.
4. Is the gent supposed to have magical metal knee replacements? If not, the knees are incorrectly drawn. I'm also surprised by his (relatively) scrawny legs, given the rest of him.
5. The lady's belly-plate is made of a soft material, as drawn. Is this intentional, or was it meant to be metal? Note that it bends with her torso motion; metal would be rigid.