How about this one?
That one I like. Pistol is pointed off to the side a bit, not obviously loaded and most importantly, it is held by an adult. This one also has a public service type message attached. My main gripe with your earlier one, besides the obvious safety issue is that the gun grabber crowd can use it to our detriment.
Here's an idea, post the photo of your son on www.thehighroad.org. See what your response is there. If they give positive reviews, I'll make a loud public apology for calling your photo irresponsible.