This would be the best way, and quite frankly its time consuming.
You'd have to open two windows in your phone. One to where you intend to post it (here), and one at google images.
You'd then have to google the exact page (EX: Naruto Chapter 615 Page 14) and hope it comes up with the page you want (sometimes the pages are different pending how many extra pages places like Mangapanda make).
Then hold down over that image to "view original image". Copy and past that url to the second tab that is here.
Takes a LOT OF time though.