Cover Page: I put this in black and white so you can see the values that you have. The biggest thing is the lighting really makes the cover flatter than normal in the composition. In this case you needed to make the shadows darker and choose a light source, different light sources will have different effects but it is very important. Also you should add a non white background for anything with color, even if it is gray then it will rest the eyes a bit. Make sure to check your values with a black and white filter:
I do this by making a new layer on top of all my layers, fill the whole layer to black, then i set the layer setting to hue, saturation or color. Once that is set up then i can toggle on and off the layer.
This is your cover in black and white

This is a cover with more contrast

Page 1: Even with having the text read right to left, you can still direct the eyes down. Have it so it flows with the eyes instead of skipping. I also moved the top so it isn't right side heavy.

Page 2: Don't get overly specific on the exact location unless it is extremely important later like in a thriller/mystery. Always look to simplify the sentences, long sentences with extra fluff in the very beginning can be a turn off for readers. Remember it is not a novel but more about illustrations and more direct as you can describe things without words

Page 3/4: It's mostly grammar and finding ways to shorten it into more casual conversation. Let me know if you want to see all the dialogue changes. I could probably change quite a bit throughout the story but it's pretty much the same idea as before.
Page 5: This page can be split in half. The top half would need maybe a few extra panels (can split the dialogue for this). The bottom half is your punch of excitement so it should be with a page turn and pop out at the reader.

Page 6: This page would have another split as you are forcing the previous panels into it. It's fine to have a page turn change of scene. If you really want then you could put a text box starting "House/home/etc"

Page 7: This page is where you can add suspense and surprise. Again because of the page split it forces the previous panels into it. It actually works in your favor as you can stretch out the lightning. Something I noticed is that you save the black fill in between panels for flashbacks but that really limits the effects you can do. Generally artists use a dark gray instead and sometimes gray over the panels to signify a flashback.
Page 7.5: I would make the bottom half it's own page and add an extra transition panel of putting the jacket on just to fill extra space.

Page 7 Example:

Page 8: It's dark outside, make sure the zoomed out views are darker as there is more atmosphere between the camera and the foreground/background. Also to make the character pop out, it is ok to make it seem like there is a bit of brightness coming from them. This is also a trick if you have a crowd and want to focus on one character (another is to put more detail on the character in the crowd and less detail on the crowd characters as our eyes are more drawn to detail). Compare with the original version as I have darkened this one as an example.
