I'm not shooting for commercial purposes, so I have no scribbles I need to follow.
But then - I often catch myself not framing my shots correctly. Things frequently need to happen very quickly when I'm shooting street. Also, when I view my shots after having developed my film, frequently some better ways to crop will come to my mind. So it's inevitable I have to correct my mistakes after the fact by cropping, straightening horizons etc. No major crops, but I have to do it very often.