Excellent!
What I'm really impressed with is that you already have the feminine inflections down very well. You have a lot of pitch variation, you've got the feminine upward inflection, and the pitch is almost already right where it needs to be. The second voice definitely sounded feminine to me, in the "androgynous" range pitch-wise.
And yeah, going from the Johnny Cash voice to the feminine voice was quite fun to listen to. (It was pretty clear that you were pushing your voice down deliberately in the first part, though.)