I use Bing image search in addition to Google quite often these days*; Google has been determinedly dumbing down its search functionality for years, and while it will grudgingly still search for what you actually typed (once you jump through the hoops of selecting "verbatim" results or putting quotes around all your search terms) for a text search, image searches are much more of a crapshoot. I find it about 50/50 that I'll get a better result with Bing than Google quite often.
*yes, even when not searching for porn, when Google's always-on nanny mode is an obstacle ... err, so I'm told.