Your shading is very good ! You seem to be a little "shy" with your pencils when it comes to draw really dark shadows. Maybe you should try to use darker pencils or work more on it so that you've got a better contrast ? That would certainly be quite an improvement.

Good luck with you comic project, I hope you're persevering because it's likely to need a lot of intensive work. I tried this a couple of time and I've never been able to finish even a single page because I tend to get discouraged easily.
However I'm eager to see what you'll come up with ^^

Hah, thanks, I'll try not to dissappoint you or anyone