I had a really hard time drawing men when I first started out. With women, it was easy- just look in the mirror. But guys? Not so much. My best suggestion is to look at photographs of men and draw what you see. Pay attention to the jaw lines, the way their hips differ in shape from ladies. Men (especially comic men) are more hard angles. Their top halfs basically look like up-side-down triangles. Don’t worry about style- accuracy is more important. Style comes after you figure out how to put everything together. If something is tripping you up, you need to draw it even more. I know that’s sort of annoying but it’s the only way to get better. Find some photographs of handsome muscular dudes and start sketching.