My thoughts on this.
I like the art and costume. Art is obviously quality. Costume retains her iconic look, but is reminiscent of her first, original costume in many ways. Plus it has that metallic sheen that hints at her powers. So all in all, the art and look for Lorna are great and rarely seen out of Marvel.
The idea of her being "evil" is an interesting one. Since it's an AU version of her with whatever changes Nate Grey thought should happen, we know Lorna being "evil" is all a matter of AU perspective. I'm taking it as a mix of playing to her long history of being used by villains (especially knowing her time as Pestilence came up), and her hard-coded mutant philosophy not playing to Nate's idealized vision of the world. Could also take it as a testament to how willful she is that while Magneto could work with Nate's designs, perhaps Lorna had to be presented this way cause she couldn't be made to fit. It also just in general plays to how Lorna as her own character hasn't really "belonged" for most of her history.
Bishop beating her is also fine. For one, this is an AU, so arguments of who would really beat who go out the window. But more importantly, we don't know exactly how Bishop won. And I'm not the sort of fan that thinks their fave should never lose fights. The losses just have to make sense. In this case, we don't have details so I can assume the loss made sense.
My last thing to say, though, goes back to the criticism I've been leveling about this book.
This "Secret History" page perfectly demonstrates even more that Bishop should've had a different book, and Lorna should've been the lead of Prisoner X. Or at minimum that Bishop and Polaris as co-leads would've been better than Bishop as full lead here. A separate Bishop book could've been all about him hunting down mutants like Lorna and starting to question the world and his part in it as he did so. Meanwhile, Lorna could've been the vehicle for Prisoner X as a representation of what locked up mutants go through, and resisting the "natural order" of Age of X. What we have instead is a single book that doesn't let Lorna lead a base concept that her Gifted use clearly inspired, and any ideas for Bishop's time as a bounty hunter (or cop, or whatever) have to be relegated to single image representations like this.
I recognize people like Prisoner X. But I don't look only at what is or what was. I also look at what could have been but isn't. I don't do this only in the case of Lorna. I've done it with Tomb Raider, Resident Evil, countless other things. My assessment is that regardless of how good this may be, a different book with Bishop as lead and this book with Polaris as lead would have been better than this book with Bishop leading and Polaris as a lower level character for his story.