There are quite a few issues I see here, none of them are critical mistakes but just make this cover less appealing compared others.
Every block of text has a different font/scheme: the author is all caps, the title is all caps w/ a different font, and the bottom "volume" text is in mixed case. I would shrink/abbreviate the "volume 1" text to "VOL. 1" and place it into the corner while making the font much smaller. I also suggest outright replacing the secondary (author/volume) font, as it seems like a generic/default font. I like the contrast between the two fonts, and I would keep it that way.
I'm not a big fan of the waves, but I'm not really sure what I would replace them with. I tend not to split my covers into sections, and keep everything onto one "section" of sorts.
The background also feels a bit empty, despite the good mix of negative and positive space. I would fill the background with something other than just plain white. You could make a grid of the small drawings w/ a light opacity and fill the background that way.
I don't really understand the two yellow circles and would consider removing/replacing them.
I would also stay away from pure white/black, and instead replace it with a lighter color/darker color. I would also consider creating a color palette/limiting colors.
TLDR: Keep text consistent, change the volume/author text to something less generic, fill the background, create and stick to a color palette, stay away from using pure white/black, and remove the two yellow circles.
The overall layout/idea is solid and I enjoy it, but it could have been done better.