Make sure you use reference for the face. I would suggest doing Gwyneth Paltrow, but the comic really doesn't look like her. Also I'm not for the bun on the hair. Off the top of my head, I always remember her taking off her helmet and her hair was down.
I like the suit design, though I agree with $!nz that the suit could be a bit "sexier." Smoothing down the hard edges on the thighs and calves would give the suit a sleek and sexy feel.
I think this model is going to turn out great in the end. Hopefully it will give you good practice with creating a female character