I thought it worth adding a little note that while the intent of the contest is to get your pose as close to your picture as possible, in some cases you may not be able to due to the joints in the figure you are using. Some twisting and bending etc (while on a human is perfectly natural and doable) may not be possible on the figure you select without some oddity. In cases like that, do as best you can while still getting the pose to look as close as possible.
Also in some cases, like the Marilyn Monroe image above, you may not be able to see all the pose elements (in this case her dress covers her hands) in areas such as that please feel free to pose those areas however you feel would best suite your pose (as evilproducer has done in this case)
I just wanted to point those two things out as I don't want anyone to exclude using a certain image or become frustrated if they can't get the Pose just perfect.
Sometimes because this is 3D and not real humans you can't always get things identical.
Also one more note, please don't feel you are constrained to only Posing a human
Feel free to also do animals etc as well. There are tons of running mountain lions and deer and cats curled up who have had their pics taken that would make for perfect references as well
Though those of the animal kingdom can prove more challenging to Pose
There are lots of Dragon images online as well and I know the Mil Dragon spends lots of time in my images so if, like me, you are a dragon lover feel free to use that as a subject as well if you choose