How does that quotation go? "Was this the face that launched a thousand ships!"
Consider crafting a website with a face that will launch a thousand (or more) hits. How can a grandson and his grandmother not draw you into whatever it is you are trying to say with your site?
Great graphics need a dynamic human face. It may be your own, a client's, your colleague's (do get permission*) or your grandchild's. Make sure it is a great shot. Capture a moment, and you are inside the city walls.
*there was an article in the NYT on permissions yesterday. Do pay attention!