All right, that's a lot to work with. =D
Nice work on them, but a couple things I wanted to point out. If you don't mind. ^^
Aelina's younger sister actually looks older than Aelina (just my perspective, I guess, lol) but one thing in particular that I found somewhat unbalanced is Aelina's younger sister's neck. It's almost as wide/thick as her abdomen, and is a bit too long.
I would recommend slightly moving her head closer to the collarbone (consider that most people can touch their chin to their collarbone when looking down), and making her neck thinner (no more than the width of her arm). =]
Aelina flying looks cute. Good job there. ♥
Kyran has a few inconsistencies (he looks like Peter Pan to a degree, just thought I'd mention that, lol - it's not a bad thing).
First off, his sword comes across his body as if it is pointing towards his right arm's wrist, and it should probably be pointing away from his body. It's really just a perspective issue, and by bringing the sword out you can solve that issue. Just move the sword so that its point ends somewhere around the middle of his right thigh, and be sure the end of the sword slowly goes from its width at the base to a slightly thicker width at its point (that gives the illusion that the "2D sword" is coming away from his body).
Second, his right hand is in a very uncomfortable position (when I put my hand like that it strains the muscles in my forearm).
All you'd need to do here, is make it so that the palm isn't facing forward, but instead make the thumb's side of the hand face forward. Or you could even decide to simply make a fist and leave it in the same position as it is (as that would make more sense if you absolutely want the hand's palm facing forward). ^^
You last drawing shows an obvious improvement (and apparently your perspective of women's breasts was that of a child's when they look up at an adult woman; everything appears larger at that age). You've also clearly gained a lot of skill in other areas of anatomy - so it's great to see that kind of comparison between years ago and now.