No, I was searching https://steemit.com/hot/photography/ for plagiarism to try to provide some small service to the community.
You need to check your photos against https://www.yandex.com and some others to avoid letting people game this.
When you search for your first pic at, https://www.yandex.com/images/search?rpt=imageview&img_url=https://steemitimages.com/DQmR8Q2533wffekYgpUxDMQRh8LvfPfhkXvEdRYVsyH7whX/20180420_170207.jpg It is identifiable.
Because the reality is that even though your photo is an original (afaict) it's still visually similar enough to get matched to other photos.
I'm like a magician that loves giving away the trick.
I've been using NooBox trying to spot photo-plagiarism.