Quote - looks good. Note that the bounce is a max cut-off, if it doesn't need all of them, they won't be used. According to me, the inner upper side of the right thigh suggest that you can use more, just try 8 or 16 or so. Perhaps an area render will reduce the time to get this sorted.

When the bounce reaches its max cutoff it resorts to using the background value. That is usually black by default, hence the black spots. You can plug the image for your environment sphere, through a sphere mapped node there for a better looking cheat with fewer bounces.