even though he is balding, the hair is still (sorry
) just a little less dense and in fact covers the whole of his crown(top of head). Unless you yourself are balding, feel your own hairline, and adjust Yoda's to be like that, although in contrast very, very sparse.
Looking terrific though, I love your work so far!
PS: Even though I'm giving advice, I still can't do what your doing, so keep it up