ah makes sense as long as you have an organized plan one way or the other :P
with regard to the art, the first BG was quite impressive feeling, but it felt a little empty with no other figures, even just super simple ones around the place. such as all the chairs are neatly lined up, things like that make the background feel a little artificial. Also for some reason, the character felt out of place in the middle, like she was drawn with a different pen setting, or shrunk down or something, she had too much detail for the size she took up. just an odd observation.
for the last panel, despite the chatty girl being somewhat petite, I cant imagine how she can lean on the table without her back or lower half leaning out more, unless she is massively short.
the books shot is fantastic and has a great amount of good details.
the first panel could have done with a few darker gradient shading at the edges otherwise overall it felt a little flat.
and another minor point, the speech bubbles are very wide, making it a little hard to jump to the next line of dialogue. You can still keep them wider than taller, but perhaps make them a bit more rounder and it will be easier to read.
otherwise shading on the objects and characters is good and adds good depth. also great use of the screentone dots which gives it a proper manga feel, although beware when being viewed at different zooms you will get an unwanted moire effect.
hope I'm not too severe in my comments but I feel like you'd want a serious review as you're aiming big with your projects, looking forward to reading more.