This is very nice, although I didn't see nothing wrong with this font but you might want to try and change it (personally I like to use wild words as a comic font)
and you need to learn how to redraw some parts of it so you won't have the text have a white area around it like it is in the cover (although I myself, am not sure how to keep any redrawing on an already existing picture consistent so I am not sure if I can help more than just telling you this)
Keep it up