the Differences in the cover page
Here are the answers:
1) Fish has different Scales
2) Mizuru has different earrings
3) Ruka's left cheek
4) Ruka's Right Cheek
5) the pomf thing has one more line
6) the scarf on the animal
7)Glasses guys tooth
Not sure if 3 and 4 count as one or as 2.