Two EXTREMELY KICKASS links for you today:
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FOR ANIMALS: "Animal Photo Art References Search" – pick an animal, drag the 3D bone skull to the angle you desire, and hit Search. It returns a bunch of photos of the chosen animal with its head oriented as near to that direction as the search can manage. No more hopelessly trawling search engine image results praying for the angle you need!
https://x6ud.github.io/#/ -
FOR HUMANS: "Reference Angle" – rotate the 3D mannequin head to the angle you desire, configure AGASearchResult/age/some other flags, and hit Search. Once again recieve a whole lot of photos automagically selected to be as close to your directions as the search engine can manage!
http://referenceangle.com/
As you can see the results aren't flawless– if you have superior references already, use 'em! But for afficionadoes of drawing stuff at unusual angles or people looking for something outside their "favorite genus at 3/4 angle" comfort zone, I cannot think of a faster and easier machine.