Ahhh worthless information, I love it.
Way back when there was only one horse power, i.e. horses. You could not get on them from the right side, horses hate that. So you mounted up from the left. Tradition continues as pilots mount up from the left side, (except for some helicopter crews and we just do it to be different.)
The fixed wing aircraft that do allow you to enter from the right, still have the pilots side on the left and as most of the pilots are the senior aviator he gets the side with his little slogan or art on it and that side is photographed more.
As for me, I show the side with the best finish, putting the "bad" side to the wall like an old Christmas tree!!
Don
I know it's only rock and roll, but I like it.