Theres a bunch of free poses for facial expressions , some of them are a bit over-the-top but by dialing back the morphs can look quite good. Use them as a starting point to see what morphs were used to build the expression and then experiment.  Konan idea of photos or mirror is a good one too. When posing the body remember that knees and elbows dont bend sideways so there are some dials you just should not use for realism, also consider what muscles become more prominent in the position desired. Making biceps and thighs bulge a little can make a big difference