Photo copyright penalties are no joke (at least in the US) - be very careful using images you didn't purchase. If they find you (very easy in many cases) and you can't prove ownership, they'll tell you to cough up (could be several thousands of $) or they'll see you in court.
Happened to my uncle's business site, he ripped 2 images, they found out, and he wound up having to pay about $7k to avoid court.
Just a word of caution lol