Most of the pin-ups I do are little practice sessions, where I work from reference. They're not full-on studies - which I really need to do more of - but they do add to a general understanding of how a body moves/rests within an environment, which supports reference-free work.
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Comments
you draw some lovely busty & beefy ladies heh
Though Imma give a tiny bit of salt, while I love the werewolf one, her pose feels the least natural of all the examples: the model is sexy posing while the wuff is trying to hide from her roommate, you know what I mean ?
While I'm sure there are a number of sites where you can collect reference, a good archive is built up over TIME by saving any image that you think may be useful at a later date.
Variety is the key. Ignore stuff that has become familiar.