I think I like the middle one best as the latter is just TOO typical fantasy. It needs to be a little bit different in order to maintain it's presence as a sci-fi world. Orange stands out against her grey/blue skin. I fixed the jaw after the first image, it was quite uneven.
This is my final piece when working with the images above. I shifted the colours in this significantly to give a more alien feel to an elf like character. I did a tutorial so I could make realistic hair and though it's not quite as good as I hoped I hope that it gives an interesting effect. I really liked working with this colour palette and I'd like to work on a full body image of this character.