Well, I want to vote for Kate.
I don't love any of these covers, but.
1. you can see that Kate has eyebrows, and Natasha doesn't
2. Take off the title and the rest, leave just a photo, and you'll see Kate's is better
These, I suppose, are not really valid points for voting Kate though
EDIT:
I want to change my vote to Natasha.
I just realised how much I dislike Kate's facen expression on her cover
And the lack of eyebrows in Natasha's cover isn't bad, well, you see "Killing Mode" on this cover as it is written, she kinda kills with her sight. The title over her face is irritating but yeah.... I want to vote for Natasha.
good points
yeah I was really torn, but I think you are right. I like Kate but don't care for her expression and I like Natasha's pose and fierceness
that being said, these still aren't very good covers IMO lol