Credits are for objects, textures, mats, backgrounds(if photographic), skies, poses, clothing, weaponry, hair, etc. used in the render, or anything you bought from a merchant on this or any other site, that was used in creating the image. The software you did it in would be the gallery you posted to and the postwork app usually isn't listed under vendor/merchant credits, but in the little blurb you write as artist. It helps people find things they might want to use in their work...hope that helps

Bryce Forum Coordinator....

Vision is the Art of seeing things invisible...