As everyone's saying, comics don't consist of just bust shots/full body shots of characters. Can you draw any pose? How about backgrounds? Can you draw characters interacting with backgrounds? Can you draw a full range of unique emotions for each of your characters? And can you do all this from any angle?
I don't mean to scare you, but comics are perhaps one of the toughest storytelling mediums out there. However, even if you're still struggling drawing these things, I still recommend to jump into comics anyway because you'll learn a lot more just doing it. Good luck!
you wont know until you give it a shot : ) i would start out making short strips with your charas interacting, showing (like these other fabb comic-creators just stated) diffrent facial expression, poses/angles in various environment, charas interacting with them backgrounds, dead objects etc. good luck to you!
I second Kupocake's answer. You'll need to draw background, interaction, a variety of poses and angles, effects, and you must be able to create a story, characters, and dialouge that are interesting at least.
But do it anyway. Practice is how you improve, if you never practice drawing comics specifically then you'll never improve in that area.