If you have that luxury and get that perfect compo, that is great, but I'm betting that the majority of photograhers all do a little cropping here and there, even if it is just a little off the top, or to remove and edge they didn't see in the viewfinder. I don't always, but will if I suddenly find a gem within an otherwise rough image. For me, I go by my gut as to what works. I can tell if there are elements I don't want in an image from the get go. But sometimes it is harder to make that slice. I have to rely on my ingrained design experient to tell me what works and what doesn't. The beauty of Photoshop is there is always an undo if you didn't work out.

Kort Kramer - Kramer Kreations