Could it be a keyboard or OS issue? I Ctrl+v and right-click>copy just fine.
Edit
[member="Aeden"]
Are you copying the URL of the picture? Right clicking the picture (at least on Chrome) and Copy Image URL. That or Right click > Open Image In New Tab > Copy the URL in the browser address bar. Also something you should set.
You see where B I U are? Go all the way to the right to where you see the left, center, middle text alignment buttons. Above that are the pasting types, word and plain, ignore those. To the right of those, what looks like a gear and wrench, click it then Checkmark "Paste as plain text by default" and click Ok