On the cover page the art is blurry for some reason. I don't know if this is a problem with the way you saved the file, or the way you drew the art, but since some of the art in comic is crisper, you might want to assess whats happening there- this is the first impression of your comic! The image quality should be some of the best!
In chapter one I notice a lot of areas where the blood has jagged edges to the lines. I suggest drawing it in a way closer to your line art as it's aesthetically jarring compared to the soft lines everywhere else.
Maybe it works better on a phone, but on my computer screen the second text box, "Bloodthirsty" is cut off, so the section reads:
- They had no weaknesses and they were,
- Thousands of years ago, our forefathers,
- were able to cage up the kind and Queen of these Afreets.
And only AFTER do scroll down and see the "blood thirsty". Essentially whats happening is the text boxes are not flowing naturally, and it's confusing to read. I know technically you're right because these boxes are in the same panel, but the panel is so long that I don't see the second box and my eye is draw sideways. If you have two bright yellow dialogue boxes side by side, that's where the eye will be tugged.
However the art in this section is the nicest in the chapter, in my opinion. It has the most mood and the demon feels intimidatig. Good job on the creature and the heavy shadows on the people. =)
The next big thing I noted is that you're balloon bubble text could be much improved by center aligning it and making the diamond shape.
Over all I suggest putting a little more effort into considering the flow of panels and dialogue, fix up your balloon bubbles, and consider that with your vertical format you can create more space so those bubbles have room to breath. They're a little squashed.
Some links to help with that: