So you want to know how to copy paste images in like this?
First join MCFacts on Discord. It is a new server ready to have players that like Minecraft in it. (Link in the comments)
So all you have to do is have your cursor over an image from any site until you have the text cursor and then you have to hold left click and move your cursor to the other side of the image until it selects the image in full blue. Then just press Left CTRL V (Only works in PMC)