found on imgur, can’t find artists name, but it’s awsome
so you want to post a cool pic but don’t know where it’s from:
right click on the image, copy URL, go to google, go to image search, click camera on the right, paste in URL, click through pages until you find a website that isn’t notorious for reposting images without credit (tumblr, imgur, weheartit.)
Put as close to the original artist’s website as you can get in the “content source” field on your tumblr post (under the extra options button at the top of the new post, not 100% sure where it is in new tumblr.)
put description and artist’s name under picture, tag picture with relevant tags and artist’s name.
saucenao: similar to google reverse image search but better for sourcing Japanese fanart etc.
will come back and update with screenshots after work if this is confusing. I’d send this as a message but someone else was asking about it too and there are always people who don’t know. hope it’s helpful and no offense meant. I don’t actually get that mad about most source less images, it’s just a nice and easy thing to do that makes your blog more informative and more courteous to content-creators.