According to this BroadbandReports/DSLReports ' forum thread, people are talking about how Google's image search isn't filtering bad contents with safe search enabled. It seems like Safe Search feature isn't doing its job very well lately, even though they don't expect it to be 100% perfect. It wasn't like this in the past when I used many times. This is bad for children who shouldn't be looking at bad images.
I searched "ants" and got a black and white photograph of a naked woman in the third image! DOH! Google's image search filtering wasn't like this in the past when I used it many times.