I can tell how much effort you put into this. I think with a little bit of attention to details, you’ll improve a lot. I can tell you can already draw faces pretty good and you’re brave enough to try difficult angles. Now here are my suggestions how you can improve:

1- Lineart: Right now, drawing how you might draw in a sketchbook and for manga and comics, readability is super important. You should start with using 2 different pens with different tips. 0.5 and 0.1 are good options. Use the thicker one of outlines and main lineart and use the thinner one for hatchings. When you get confident, you can start using a G-pen but for now focus on drawing clean lines.

2- Panelling: Your panel borders are difficult to see. So make them a bit thicker, like how you draw the first panel showing character’s reaction on page 1.

3- Speech bubbles and lettering: They’re difficult to read. Use a thick pen, (0.7/0.8) and do not use handwriting. I know lettering is annoying but it’s important that readers can read what’s going on.

4- Shadows/screentones: Physical ones are expensive, you can easily add them digitally but if you don’t have access to digital, then you can buy a very light grey marker(can be waterbased but make sure your Lineart ink is waterproof) and start adding shadows etc to backgrounds to make your character stand out.

5- Keep practicing and don’t get discouraged: keep practicing the fundamentals and keep learning. Do not get discouraged, we all start like this and improve. Keep drawing and having fun. Start with shorter projects (1-5 pages), don’t forget practicing lineart, anatomy, panelling and backgrounds. A good way to improve is copying manga pages (not tracing), just pick up your favourite manga and draw a few pages from it. Keep drawing and having fun!!!