I'd recommend Senshi-stock on deviantart and Croquis Café on Youtube!
Also: Senshi stock doesn't have nudes so that's more of a sfw than Croquis café is, but I think they've labeled each video that is nsfw!
They've got some pretty good poses for reference, and it's my go-to site whenever I feel out of the loop and want to draw something more anatomically correct.
Looking at your style, it feels like you've already got a good balance of understanding how the anatomy works but I completely understand your reasons as to why you wish to study anatomy more.
I live by the words: "Knowing Anatomy is knowing how to break it", which pretty much means: knowing how to exaggerate, knowing when and where to break the rules so to speak!