Haha I love it. My only comment would be thatthe long hair is kinda making me facepalm, though that's just because I'm in a different fandom with a main character who's hair is white and all the sues have hair like this, so it's really your fault. I think it woul make for a hilarious gag to have jack accidentally freeze the back of her hair and then just have this massive lump of frozen hair, heh.
Weell I don't see how I'm at fault here. Jack's hair is originally white. For female characters to have long hair is not a foreign concept; in addition, she's no image of a sue because I did not design her hair as something flowy, fluttery sparkling magic green hair or something. Also apparently, 'Mary-sues' take form in all different styles, if you have not noticed.
Therefore, I don't see any correlation to Jackie being a 'sue' whatsoever--however I do realize that is completely by your own bias.
I know, I just... I dunno, think if jack were a girl eh'd have a shorter hairstyle. I wasn't trying to put you on the spot. Seriously, this is an awesome design and I wasn't trying to call it sue-ish and... yeah.
Oh then that's a matter of preference. I noticed a lot of short haired Female Jack and decided to do something different. That's quite aright. It seems we both had misunderstood somewhere along the lines.