It's the scan that is big lol... Original drawing is smaller than A4 size, maybe A5 or something.
As for the remaining three; it is as follows:
- The flying one is Nymph from Sora no Otoshimono,
- The one in front of the tree with the curly hair is Morishima Haruka from Amagami SS,
- The one scolding Kana is actually Tohsaka Rin lol