how do you find a good reference to a pose you have in your imagination?
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One other thing that might be helpful are these types of figures.
Using a desklamp on a hinge and getting some lighting information when you snap a picture has been pretty useful.
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I don't think this has been said and I haven't checked out the suggested sites, which may be a better solution, but if you search in Google for Poses, instead of trying to look for a unique pose, you may find what you're looking for. That's helped me in the past. Also, it helps to learn if you find a close pose and modify it a little.