Firstly, for Elsword:
His legs look far too short. Looking at it closely, it looks very awkward. You need to make the thighs a little longer, but the lower leg slightly shorter.
His right arm shouldn't look like that. For reference, look at your own arm and study the elbow point, it shows you some obvious flaws.
I dunno if you meant for this, but I can see the bigger Elsword's arm though the cloth loin.
Not much to say... Just don't like the face. But her legs are too long. Same problem with Elsword, study the anatomy.
The eyes are roughly off. A little off, not too much of a problem.
The hands look huge though. Try and minimize it a little. I know you're trying to draw them closer to the official art, but still.
Her cheeks also look very fat. You should round them more like the second Aisha you drew.
Not much problem, but there's inconsistency in details like folds.
Other then that, you can improve more. Good job. (+REP).