Image Source: http://logbaby.com/encyclopedia/zuma-rock_9814.html#.WuWaBohubDc
Not indicating that the content you posted including images is not your original work could be seen as plagiarism.
Please refrain from using #photography for posting art, graphics, memes, or other people's photos. Repeated use of the #photography tag when posting other people's photos without attribution or indicating it isn't yours could also be considered spam. Spam is discouraged by the community and may result in action from the cheetah bot.
If you are the photographer please reply and let us know!