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Thank you! What helps me a lot is looking at similar pictures, to get a feel of what type of poses are suitable for a certain shoot. Then I direct my model from those poses. They'll always interpret it a little different, so you'll still get a unique shot.
So basically, I look at tons of pictures of poses, and then I decide which ones I like and which not. And in time you'll know which poses work and which don't. :)