First thing I noticed is that I'm having trouble following the flow of the comic. I don't know which panel is first, or whether it goes left to right or vice-versa so you could look at how other comics do their panels.
Another thing is your anatomy is off, so practicing drawing poses will definitely help you out. You can find reference images online or through some books to help you out.
The last thing you could do to improve, is to play with the line weight. I noticed for some scenes where the characters are in the distance that the thickness of the line is the same with some panels where the characters are closer. By playing with the thickness of the lines, you can really add the effect of distance and detail to your comic.