Be aware that using images that are covered by copyright restrictions for business purposes may lead to large legal and financial headaches. It is a good habit to get into using sites which are 'Creative Commons' where the copyright restrictions either do not exist or are very lenient. The Green Creative Commons site is the best place to start - but also have a look immediately beneath it at some of the fact sheets you can download from their site. As always, you should acknowledge your source in some kind of a bibliography - that is where you got your image from.
