Wow man this is freaking awesome. I got so inspired just looking at it. I love the flow of the cape, it just looks so fluid.
This is hard to critic because its honestly above my level of expertise with 3D design at this point. However from an 2D design perspective and with figure drawing it would be interesting if you gave the hips and shoulders a bit of tilt. (Nothing too serious just enough to offset the perfect alignment just a tad)
For the hips:
The foot that is planted on the ground would shift the hip on that side up a bit, while the other side sagged down.
For the shoulders:
The shoulder above the planted leg and raised hip will be a bit lower than the other shoulder.
I know you are probably super busy but if you have time to try and changes I think this would be interesting. I have attached a reference (more exaggerated than you will probably want.) to help you visualize my words if what I am typing is complete rubbish. Great work dude, very impressive.