The rules of use are fairly simple. All I ask is that you credit me in the description of your work and you send me a link either through a comment on the piece you used or through a note, that way I can favorite your work. Also, feel free to check out my art account ~streboradnama (https://www.deviantart.com/streboradnama). If you happen to see something on there that you'd like to use as a stock then please let me know before doing it.
Breakdown of my stocks:
Animals: Swans, Banana Spiders, Argiope Spiders
Household Items: Wall lamp, Canon FT QL camera
Nature: Clouds, Waterfalls, Rivers, Trees, Trails through the woods, Rain puddle
Objects: Park lamp in the snow, Park clock