Most retail stores do it, it seems to show some trust in the real world so that you can find the manager if you really need them and you see them on the sales floor. But I don't see how it could help trust in the digital world - it could be a random person and not truly you, or it could be you and you're just a con-artist trying to earn more trust.
Either way, I don't see why people would trust you any more just because a picture of someone who you claim is you is on your website.
When I say "you", it's about anyone in general who puts pictures on the site. Not calling you a con-artist, it's just an example.