This is a pretty cool picture you have here. Though if you change anything I think it should be the mask. For some reason the straps bother me. I really dig how the claw came out though. If your looking for a new pose why not try drawing Rarity doing one of Vega's specials like The Flying Barcelona Attack, that one looks pretty elegant. Or you can draw her finnishing a Rolling Crystal Flash.
All and all I think you did a great job, keep it up Brony.
Doesn't Vega make a mess out of his opponents? And does he perform his fighting with grace? I've seen some of his gameplay, but I can't quite remember how Vega fights. As for her pose, I don't think it quite matches how I would imagine Rarity's fighting style to be. I imagine her to be more like a ballerina, when it comes to fighting. Eh, just my two cents.
No no, your correct. I've actually had some issues with her pose for a while now. I agree it doesn't look quite like a Rarity pose. I am planning on redrawing her, same design, just different pose something more graceful. Something along the lines like this: [link]
Hopefully I'll be able to do it soon. But I appreciate your critique ^_^
Yeah, it's just the stance. Like how her fe-- oops, hooves, are positioned. From looking at a video on Vega, I think Rarity doing a pose from one of his aerial moves would be perfect. Some of that slashing action in the air... Ooh, I would fav' that picture so hard, hehe.