I made canweimage.com to solve some of the pain points with generic image search engines in mind. All search results come from Wikimedia, so licensing is usuall

I made canweimage.com to solve some of the pain points with generic image search engines in mind. All search results come from Wikimedia, so licensing is usually pretty liberal. You can also limit results to public domain only. No images on Wikimedia are watermarked, that I have seen. Strict search is the only option on canweimage. It's not full proof either, but I check every file name in the results against a very long list of NSFW words and phrases. Any matches are filtered out. While you'll still be dealing with dimension issues yourself, each result displays its dimensions. That can help pick more appropriate sizes.