Unless specifically stated in the assignment, all images submitted as part of an assignment shall have no post-processing. This includes cropping of the image. Learning how to frame things correctly the first time is something I think is really essential to learn. While post processing can be an important and valid part of developing your art, that's not what y'all are here for right now. You can sepia tone stuff later ;)
Also, if I ask for you to shoot a "roll" of images, 1 roll = 36 images. If I'm asking you to shoot rolls, I expect you to NOT delete any of those images.