As a marketer, I look for photos that evoke nostalgia tied to specific emotions. For example, brides may be caught up in the story of love, family, and devotion that their grandparents shared. A poster of an older couple cuddling on a sofa with a photograph of their wedding clearly sitting behind them draws the new bride into the story of the marriage that she desires.

Make sense? Think of the story your target audience tells themselves, the emotions they want to resolve through your services, then tie together in the poster.