You know how you do that thing in RP when you're tagging and you're trying to get body positions and actions right in your head and you kind of act them out yourself to see if what you're typing makes sense?
Artist dolls are good for that, too, but you need a really good one for it to hold the pose. Otherwise, on the reference picture end, I like Senshi Stock
Just half the time I do it without realizing or thinking about and then I'm like "man what idiotic expression do I probably have on my face right now that everyone in here can see."
dont worry I do it too