All the elements look very good in themselves, but the composition as a whole isn't terribly interesting. There doesn't seem to be much interaction between the characters and the overall impression is a bit uniform outside of the focal point.
I think the main problem with the interaction between the characters is in the pose of the guy with the axe in relation to the one in the air. He's obviously the most pressing threat, but seems to be completely ignored. You could either change it by having axe guy parrying him, or take out flying guy altogether. I'm actually for the second option, it's both easier and gives the image some empty space and a strong bright diagonal in the image. I also think it would help the viewer in following axeguy's gaze and the diagonal formed by shoulder-arm-cloak-enemy sword to the minor focus. Just my . (I'm hardly an expert on composition and much too lazy to implement it in my own work )