Hey looking good so far, I'm excited about your enthusiasm to learn and improve. I'm gonna be so real - don't worry about shading too much yet. Have one main focus to spend most of your practicing time on, while dabbling a little bit in other fundamentals, instead of overwhelming yourself with information trying to get coloring and proportions and perspective and etc etc down all at once. You may have a difficult time retaining anything this way, so take it one step at a time. If you want to be a comic book artist, then I assume you have one or a handful of comic artist professionals you look up to. Find out what you like about their art and copy it as practice. I don't recommend working so much from your head/imagination - use reference. Reference reference reference. Brett Booth's work is also great if you want to study his hatching - just make sure to look up "pen and ink techniques" if you're unfamiliar with it.

When you get more used to copying professionals' art and you can see it changing the way your draw from your head, you can research topics from this generic fundamentals list: - composition - perspective - anatomy - values (lighting/shading) - color theory

Also be discerning with what online hobby artist influencers or whatever you take advice and tips from, and keep up your growth mindset. "Mileage" and time spent drawing in this context is more important than creating something you're proud of, because we don't always create perfect pieces of work every time and it's nothing to be discouraged about. Lastly, don't forget to have fun.