Some various tweaks. I didn't do much to the leading arm, but I gave the far arm more movement to differentiate it and added leg-extend frames, with some cape tweaks to keep it fluid.
I also added a bit of coloration to the area the elbows would hit, to give it the impression of the leading arm's elbow hitting into the fabric as it swings back. The cape animation still needs a lot of work here but hopefully it gives you some ideas!
Really like the character design, puts me in mind of Hyper Light Drifter's excellent minimalist stylization.

EDIT: And just in case you want to keep it six frames, I swapped the new ones for the frames immediately after to get this:
