Here they are:
Rule #1 - All guns are always loaded.
The only exception to this occurs when you have a firearm in your hands and you have personally unloaded it for checking. As soon as you put it down, Rule #1 applies again.
Rule #2 - Never let the muzzle cover anything you are not ready to destroy.
You may not wish to destroy it, but you must be clear in your mind that you are quite ready to if you let that muzzle cover the target. To allow a firearm to point at another human being is a deadly threat, and should always be treated as such.
Rule #3 - Keep your finger off the trigger until your sights are on the target.
This we call the Golden Rule because its violation is responsible for about 80 percent of the firearms disasters we read about.
Rule #4 - Be sure of your target and what is beyond it.
You never shoot at anything until you have positively identified it. You never fire at a shadow, or a sound, or a suspected presence. You shoot only when you know absolutely what you are shooting at and what is beyond it.
You can make all the exceptions in your own mind that you would like, the fact of the matter is you loaded a firearm, purposely got in front it if while loaded (although you claim the chamber behind the barrel was empty) and took a picture. The act of unnecessarily handing a loaded firearm for the sake of a picture, regardless if you decided to stand in front of it or not, is unsafe in and of itself. They're not toys so fiddling with them unnecessarily for the sake of entertainment is in fact dangerous and does violate rule #2. The rule doesn't make exceptions for "thinking" you left a chamber empty or not having your finger on the trigger. It simply states don't let the muzzle cover anything you don't want to destroy. If you wanted to destroy yourself or your camera, I guess that changes things.
If you want to take pictures of firearms, I suggest you do the following.
1) if you want to shoot pics of revolvers that appear to be loaded, create dummy rounds that lack gun powder and primers. Simply load a round into an empty case and seat it. That, or cut a wooden rod to length and glue a bullet to it.
2) make sure the weapon is empty before setting the set, double and triple check to make sure it's not loaded with live ammo.
3) take your pictures, then once again clear the weapon and store it.
I shoot pics of weapons too. Here's one I shot this weekend. Note that the magazine is empty and the weapon was checked several times before setting the set.