Work in progress, here... Just wanted to show you how it's coming along! 
By karooble
It'll probably be a full-length piece, but a lot of what's below the shoulders is still sketchy. Expect more later! 
Absolutely gorgeous. Those collarbones are very anatomically correct.
And for once, she has her cap taken off!
One hard thing when drawing Saira, for me,
was the fact that, yes, she is attractive in her own way... But very much in her own way.
Neither does she seem to pay her own beauty much mind
and the cap is really her trademark.
I've actually taken her hat of in one or two of my drawings,
the excuse being she is washing her hair (in tears) or have had the hat stolen (by a creatur made of flem) and is retreiving it...
This is is a beautiful rendering of Saira,
I'd love to see more.
Any photo as reference?
I wish Nifflas would've chosen someone for me to have as reference,
but, alas, he didn't. Thus her features differ a bit from piece to piece,
the main thing defining her being her colours and equipment.
One more thing, is that the outcome is very different when you have her skin the properly dark brown and the hair jet black. I felt there was always a tremendous difference when lineart was coloured,
more than usual for my lineart.
One tip is that Nifflas has described her eyes as pitch black.
They might shine a lot, you know, catch a lot of light,
but there really is no colour or hue at all that visibly separates pupil from iris.
And its not really a braid as much as it is a ponytail, her hair.
And the last guideline I can recall atm is
that she is about 170 cm.
This beauty makes me think a lot about Sairas sister, the one in the carcrash.
She is up until the carcrash leading a more conventional life on Mars, from what I've gathered from the game,
while Saira took her saucer and went exploring outer space.