When I first started shooting/retouching I remember having a conversation with my brother where he advised against "funky crops".
No, not like corn and wheat.
We were talking about unorthodox aspect ratios (crops) for the final pictures. The above picture is a cropped version of the original at a very unusual final resoluation of 1200x608. Why you ask did I crop it like that? 3 reasons:
1. There was too much white board on the bottom that needed to go
2. Using my traditional 2x3 ratio I would lose too much skin
3. I wanted to retain as much skin as possible
That's it. My considerations forced me to break the rules. But sometimes you learn the rules so you can break them :)