The problem is when you use the #photography tag it's as if you're saying that you are the photographer. Especially since you also tagged it with #travel. People thought you traveled there and took the photos and when they looked them up, they found otherwise and reported you to Steemcleaners.
In the future, it's good to always add the source, even if its Pixabay, and to only use the #photography tag for your own photographs. The #photo tag is a better choice for photos from the internet and is just as popular.
RE: Skopelos Greece