What's interesting is how people position parts of their bikes when taking pics of it. I like to align the left, non-drive crank arm with the chainstay so the line of the chianstay is extended, giving the bike a sort of agressive, almost moving forward posture.
Some do not seem to have any preferences, but I do notice that others also liket to align the non-drive crank arm with the seat tube wich kinda gives it a sort of very stable/planted/static appearance.
I also like to keep the chain on the big ring on the crank to give that part of the dirvetrain a cleaner appearance which also results in more interesting looking shift lever positions. Some of the best shots I've taken of my bikes are also from the drive side rear quarter veiw.

Chombi