Oh...they're in New York? Never mind my comment regarding the salt in the last page or whatever. I think you've managed to perfectly grasp the wacky style of a Japanese person protrayed in manga. Great job!
You know, the way you cropped these really seem to emphasize Darby's smallness, she's right up on the margins and that also reinforces her role as a little sister. I love it. Even though I love to see her shiny happy face I think it's very appropriate to portray her this way in comic that focuses on Koji!