What I do when I want to pose something and there isn't a canned pose for it is to just take something that is close to the pose I want and then just start spinning the dials. It takes a while, but like anything, the more you practice at it the easier it gets. This one for example, could start as a kneeling pose, which there are lots of in the Free Stuff section, and then just move things around to make it look more like this. Turning IK on and off for the hands will let you get the hands just where you want them.