WATCH THE STOCK
I can’t seem to stress too much how heavily designs (be it websites or print materials) depend on professional imagery that conveys a very specific atmosphere or message. However, not every client is willing or able to afford a professional photographer or illustrator. Stock images are certainly an option, but one that should be explored carefully and with the awareness of its traps and pitfalls. 52 weeks of UX features a nice little article on this topic.