I like it. Your work looks great in a more realistic style. Don't lose yourself though...your cartoonish work has its own unique charm and you should definitely keep developing that as well. But I like this a lot.
Well this is a nice change of pace, Ms Isley in this rendering appears innocent, gentle and dare I say it harmless which would add to her danger as she is most definitively not harmless when she wishes to be. This version brings to mind that classic Ivy that used poisoned lipstick rather than merely her touch to deliver toxins. As such she could easily split into a party or similar gathering to interact without any being the wiser, a lily concealing a rattlesnake within its petals if you will.
From the facial structure I would estimate her at 25 or so years of age so if anything you have in this version created an Ivy that can be an opponent for the entire range of the Bat Family without coming off as 'strange'.
you'll definately get extra work as animator who has different styles..... what matters is that you can draw.....if your working for various client your gonna want to change your style......but to have to draw like the teacher isnt right unless its a module etc