Picture of you or your wife on the vehicle will just give a criminal an ID verification of what the owners look like easily setting them up for a possible crime by knowing who is walking to which vehicle...
Hate being a downer on something nice but have seen it happen in Vegas many times with those little stencils of the family, kids and even dogs on the back of SUV's even naming their kids...about 6 months ago two guys were chased off trying to lure a little girl and her brother into their van by using their names and even saying I found your dog (which happened to be stenciled also), luckily a neighbor saw and yelled out to the kids and the guys took off.....just saying be careful of how much info you put out there on your vehicles...