try www.corbis.com for reference pictures. Just type in whatever you want a reference of in the search field (example: man, woman, nude, leg muscle, baseball) and you’ll probobly get 10,000 results. It helps if you get a membership so you can change your viewing options to 100 thumbnails per page and it gets rid of the watermark found on the photos.
I normally use this place for Nudes when I want to do some figure drawing. It can be hard for me to keep my mind on the drawing when using nude model photographs from some of the other reference sites. This place is great, I’ve found hundreds that don’t have that “naughty” look.
only con to this site is that the pics aren’t hi-res unless purchase them. But thats how they make their money. So cheers to both.

Going to my favourites for sure.