Hi there!
I've known it as a posed promo of
Linda Darnell from
Sweet & Low-Down (1944), which is what I see
johnbear has credited it as too.
Of note is that the posed promo has the production number "638" (followed by image number "508") written on it at the bottom right.
This corresponds to 20th Century Fox's number for Sweet & Low-Down (1944), see the other promo card's top right hand corner for proof of that.
Linda Darnell does star in Sweet & Low-Down (1944) so that at least seems to back up the claim.
It's
Lynn Bari in that example promo card, who's the other female star from the film, but I don't think it's her in the posed promo.
I'm not a Linda Darnell expert but it certainly looks like her to me.
Hope this is of use!