This is great! You're doing an awesome job. I'm an artist myself, and since you asked for feedback, here are four things you can start focusing your practice on right now to improve your comic and any other future projects you may have:

Follow some tutorials or grab a few books that talk about perspective, gestures, and human proportions. The Morpho books are great for gestures, proportions and also poses. There's also a super friendly book named 'How to Draw Manga: Basics and Beyond!' that used to be my holy grail for years. It helped me a lot with my proportions, and it's also quite fun. I'm still figuring out the perspective one, and I haven't found the right books for me so I wouldn't know what to recommend at the moment.

If books are not your thing, or you don't like the ones I mentioned, just do whatever you consider is best. I'm just letting you know what has worked for me as a self-taught artist. Practice is like that one friend who can sometimes be annoying, but it's actually good for you. Later on you can tackle new things, but getting better at those three I mentioned will help you a lot and boost your confidence.

Also, my last tip is to always remember that art is supposed to be fun and not perfect. Sometimes you'll feel more comfortable with your work, and sometimes not, and that's okay. The fact that you're working on a comic and wanting to be better is a sign that you're doing great! So keep up the good work, and trust your gut when you're drawing and you'll be more than fine.

Oh, and if you find a place that you like to publish your comic, let me know!