I think the anatomy could use some work, the best way to practice it is to either break it down to simpler 3d shapes or study anatomy photos or drawings.
I believe you're working traditionally with pen'n ink? Try to practice the ideal use of line weight. I can notice that you have some sense of perspective in your art, but currently your art seems a bit flat due to the same line weight used on the characters and the background. The rule of thumb is to usually give the closest object in the panel the thickest lines. It will create the illusion of it being closer to the camera, then give the background thinner lines to make your characters on the front more visible. Made a quick example of how it works:
Other than that, keep on practicing, and you'll keep improving, as you keep on drawing