There are no rules or guidelines to tell you when and how the compositional guidelines can or should be broken. You do what you have to so that you get an image that works. There is no "cookbook" approach to creating a compelling image.
Cartier-Bresson's quote in my tagline really says it all, although a number of sources suggest the updated version that applies to digital photography should read " Your first 100,000 photographs are your worst". Cartier-Bresson made his statement in the film days, when photographers spent a lot more time before pressing the shutter release because of the raw material and processing costs.
Lots of practice and critical evaluation (by yourself and others) will give you the knowledge and experience to recognize how to compose (artistry), shoot (technical skills) and then finish the image in PP (both artistry and technical skills).