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all photos are downloaded from social networks, being shared by owners.

Well either indicate this; literally by putting that exact line at the bottom of each post. Or indicate the particular social networks and sites you get the photos from. If not you will likely find yourself in some trouble with @steemcleaners down the road. I'm sure if you actually had credit too, you might actually get MORE upvotes, then if you just have 30 photos with no text. But you do you man, its wtv you want.

thx for advice , post deleted

Not citing the source of photos(images) is plagiarism. Here is a post on why this is bad, and here is how easy it is to find allowed photos.

Creative Commons: If you are posting content under a Creative Commons license, please attribute and link according to the specific license. If you are posting content under CC0 or Public Domain please consider noting that at the end of your post.

Not indicating that the content you copy/paste is not your original work could be seen as plagiarism.

If you are actually the original author, please do reply to let us know!

thx for advice , post deleted