Photos are grouped into 1400 categories. The photos vary in proportion and quality. They can be used for personal or commercial purposes as long as you credit the source. Still definitely worth searching in the event you will need a specific photo.
If you would like a bit more variety, consider adding several images to the exact same page. It’s possible to locate some pretty obscure images here as a number of the pictures would not be possible to find elsewhere. If you are in need of a high resolution image, you will need to pay for it.