I have asked on twitter whether this is who I think it is, photographed years and years before she became famous. And, presumably, before she learned about the Four Rules. Her finger should be OFF the trigger because her sights are not ON the target. That is because all guns are always loaded. If you doubt it, go around touching triggers at random.
Other than that, I can't fault the pic or the caption...except...please, people. "It is" has for its contraction "it's," while "its" is a possessive pronoun.