How do I tell if an image upload is new or already attempted?

Sometimes I feel there's an image I want to upload, but the source is quite dated, and I'm not sure if it's brand-new or if it's uploaded in the past, and possibly deleted. And I kind of want to avoid re-uploading the same thing if it's already tried and deleted, instead of just looking at what happened with the previously attempted upload. If it's avoidable, that is.

Put the image source in, then click the "similar" button next to the source field before you upload.

Ah, I see.

Does the Similar button scan the actual picture for similarities, like TinEye?

It's a thumbnail comparison, should be similar to TinEye.

For Pixiv, if your browser supports userscripts, the "Endless Pixiv Pages" and "Full size and Image Search" scripts from forum #8502 add links to that image search and run source searches to make things a little more convenient (some editing of the source code may be required).

How about this picture? http://blog-imgs-30.fc2.com/a/v/e/averagecupicupi/sangetusei.jpg

From blog: http://averagecupicupi.blog42.fc2.com/blog-entry-42.html

I don't know if this is actually done by the blog owner. I tried searching in TinEye, Google and Danbooru Similar button and no results, so I doubt it's copied from somewhere else. But I did some research on averagecupicupi (artist "average" on this site, pixiv is http://www.pixiv.net/stacc/lien1) and I don't see this picture there, and also the art style doesn't match up.

• go to the artist search page
• input " http://blog-imgs-30.fc2.com/a/v/e/averagecupicupi "
• find artist #59092 (average)
• check both Pixiv and the blog on fc2
• notice that the blog links to the same Pixiv account and uses the same avatar image
• assume that the artist is indeed average
• tag the image average

Evangeline_A.K._McDowell said:
Put the image source in, then click the "similar" button next to the source field before you upload.

Aside of that, you can also use Danbooru image search directly.