If you're looking for a decent replacement to images.google.com, I run https://canweimage.com. It gets results from Wikimedia Commons. There's also just https://commons.wikimedia.org/wiki/Main_Page. I built canweimage because Wikimedia Commons used to be harder to navigate (once you searched, you then had to click through categories and subcategories to see image results). Looking at it just now, and that doesn't seem to be the case anymore!