I don't think there is much wrong with the right bag. Keeping in mind you are drawing a flat part of a paper bag, and it's also against two other bags that show more than one side of it to give it a 3D effect (which the right doesn't have).
Other than that, a fine drawing. I know how messy working with chalkes can be, so trust me, this is great.

Do you always work with chalkes as your chosen media?