Asking for feedback seems the same as asking for help. Is there a difference?
When it comes to battle photos, angles and timing are going to be very important. Choose angles that show the action without it being blocked or turned away from the camera.
The timing of the shutter will determine which part of the action you will capture. It can be randomly done, shooting rapid-fire style, or you can plan what moment you want, and do your best to click the shutter at the best moment of the action. It is helpful to have some specific moments in mind that you want to catch.
Your battle shots seem too random, lacking control of angles and timing. As others mentioned, faces are hidden. A better angle would show faces. Try to time the shots when arms are not blocking the face. The cosplayers can also make effort to do their action, playing to the camera.
Here is a sample battle from my gallery: http://www.cosplay.com/photo/2346981/