There is a difference between when third party content is your post and when third party content adds to your post.

The post that was downvoted by steemcleaners was over 100 words of original content with a few pixabay images interspersed.

Pixabay example,

There's no limit of what you can use these cool pictures for. Big thanks goes to our generous contributors, who are sharing their works freely under Creative Commons CC0 with you! Although giving credit is not required, it's always appreciated. Now, go grab it - and enjoy!

https://pixabay.com/blog/posts/40-free-christmas-wallpapers-2017-144/

Also,

https://pixabay.com/photos/fox-nature-winter-snow-mammal-4893199/