Finding proper photos for your business needs is as simple as doing a Google image search, however, use of these photos will certainly get you into trouble with copyright laws.
However, there are tons of free image libraries online that provide unlimited use of free images that you can use, worry free, for any of your production needs.
Here are a couple of the best online free image libraries:
1. Stock.XCHNG: With over 400,000 images on a variety of topics, this library is sure to have what you are looking for. However, their 
licensing agreement is a bit complex, so read the fine print.
licensing agreement is a bit complex, so read the fine print. 2. Openphoto: Originally established in 1998, this online library has been acquiring photos in its library for 15 years.
3. Stockvault.net: This library is much smaller than the competition, but the photos are of high quality and high resolution. Clip art, textures, templates and backgrounds are also offered. These photos are free for non-commercial, personal use only.
4. Unprofound: This site is a no-strings-attached kind of program. There are no significant restrictions, no registration required for download, and the site is non-profit (so you won’t be hassled by those annoying ads).
5. Free Media Goo: The entire library on this site can be viewed in a couple of minutes, so it is much smaller than others. However, with some incredibly impressive photos, no registration required, and audio samples available as well, this site is appealing to those looking to simply download and go.
Sources: Tech Radar