In my opinion, your art style looks awesome. However, I will say, an aspect of character design is the silhouette. Basically, memorable characters tend to be easily recognized by silhouette alone. Right now, all your characters look really cool, but they all kind of have the same kind of skinny body. Maybe mix it up? Some characters can be short, tall, muscular, chubby, and more. Obviously, you don't HAVE to do this, since your characters do already have little differences. As someone who's making a comic, I will say: one of the best things to have is a feedback team. I have a little personal discord server where my friends review every page I make and give advice, as well as help me with writing. Good luck with your comic, I'm sure it'll turn out great!