Please source link any pics not of your own making.
Finding sources are as easy as plugging the pic into tineye.com and picking one.

https://tineye.com/search/c74a6d20fcd4a34acbbf6a5c97a625880862b69a?sort=score&order=desc&page=1 https://tineye.com/search/4e8ff1f316871633cac2b8886e499ab411834547?sort=score&order=desc&page=1 https://tineye.com/search/1573e82c8a48e75d42e477f4279b6758e3a1987f?sort=score&order=desc&page=1

Doing so makes it much easier to gain compliance to this policy from all authors.
Your help in mitigating abuse of the reward pool is appreciated.