Where did all the web image previews go?

When I look for assets using the image search function most of the results have blank previews. This is incredibly annoying seeing as how it is difficult to find anything I need even when I looking for something as simple as a table.  Here is an example.

Hi Mikey H.,  What you are seeing is not a live search of the internet. Roll20 hasn't been able to use Google to search the internet for years. What you are seeing is an archived search. Additionally dundjinni has been fading away for a long time.  In short, anything you see on the web search part of the art library is a memory, and someday even that memory may be gone. 

I stopped using the "web search" function for finding images a long time ago, for the reason that Gauss has given. I've had images that I took from using that function suddenly disappear, leaving handouts without images (as you show) and characters with invisible tokens (and wasn't that a PITA!). Just use Google (or your favorite search engine) directly to look for "Image <table, or whatever>", download it to your local drive, rename and edit to suit, then upload it to your library. This takes longer but also gives you better control over organizing your images.

Hi Mikey! As additional insight, Roll20 used to allow web searching in the VTT by utilizing Google Image search. Years and years ago, Google changed the terms for the usage of its search API in other sites, and this became untenable. The terms did allow Roll20 to use a "snapshot" of the most recent findings, which it has maintained as a courtesy. It is not live and cannot be edited. And as others here have stated, as sites like Dundjinni go dark or sources expire, it can do nothing but return a broken link. Don't bother using it.

Along the course of the disappearance of "From The Web" search results, Roll20 has added and organized more under Free Assets, so I would check there first, before going into the Google Images save-and-upload routine.  Art Library > Premium Assets > FREE ASSETS