Muscle Plus - https://freephotomuscle.com/

• A stock image library run by All Out, a muscular performance group based in Tokyo. The library is described as "free photo materials of macho men that are unlikely to be in demand" and features a variety of muscular men pics doing mundane chores or completely random activities. Is filterable by model, muscle focus, and more.

kingcholera's Reference Collection - https://www.patreon.com/collection/20360

• A 3d pose model reference library made by an artist on Patreon. Most references are to be paid for via Patreon subscription, although for a very generous minimum of 1$! However they also have a VAST amount of free references as linked here for anyone to look through and use! Their work is very good, and if you're willing, the subscription would definitely be worth it.

Reference Angle - http://referenceangle.com/

• A site where you determine what face angle, emotion or age range you need for a reference and it gives you various real life images of people for reference.

Human Anatomy for Artists - https://x6ud.github.io/human-anatomy-for-artist-search-helper/#/

• Another site where you can identify a body part you need a reference for and it gives you real life photos for reference!

Animal Photo Art Reference Search - https://x6ud.github.io/#/

• Another site where you identify what angle you need as a reference but for animal heads angles! It gives various animal photographs as reference and you can even specify certain animals for it to give you!

SketchDaily Poses - http://reference.sketchdaily.net/en

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OSF Costume Rentals - https://www.osfcostumerentals.org/OSF-Costume-Rentals

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