More sketches about holding axes and a little something on halberds.
Figure A: Holding a big axe in a more neutral pose or at attention if you will.
Figure B: Holding and carrying a larger axe with one hand looks more natural and balanced if it's held near the actual blade. That's the heavy bit so it's easier.
Figure C: Holding and carrying a halbard. Just a guess but it looks fairly alright. Note that the blade is pointing downwards.
Figure D: Axe vs axe. The one on the left seem ready to strike a very impressive blow but the pose is actually too exaggerated. Bend your arms backwards like that and see if it feels comfy and natural. Not for me. I believe a more natural swing starts with the hands right over the head, not over the ass.
Figure E: Halberds! The first sketch swinging the halberd looks impressive but shifting the center of gravity like that would make you lose your balance...and hurt a cat.
Figure D: I'm not a historian or a medieval weapons expert, but my best guess on how a halberd was used in battle is pretty straight up and forward, letting gravity do its thing.