Small change idea. When you load the IQDB search page before you put in an image to have it search for, it says "no similar posts found". This can make it confusing for a user to know if the site has processed their request, unless they watch the page loading symbol in their browser. Especially if uploading a larger file to check, since the upload may take a bit.
The change: simply make

Similar Posts

No similar posts found.

not show up until after the search is complete. (Or the found results if there are similar enough posts found)