Very nice! I personally prefer the hair without the dark lines to outline it. I think if you continued to use the shading as you've already done a bit to separate a bit more chunks of hair it would have a very nice effect.
There's lots of improvement, especially in shading! Well done you! ^^ However what struck me as being slightly odd is that in the second one the hair has no defined lines, which it seems as if it should have, as the body does... For this style I'd actually say the hair is better in the first, you should combine the defined lines with your improved shading and it would be perfect! Of course this is only my opinion, this may be your style, sorry for being a little critical, it's still awesome! Keep up the good work!