I'll give a quick few comments.

Your pose seems to not match the intensity of the spell. I think it'd be neat to see a more dynamic thing, like slamming their fist into the ground or something. This is more of a "catch a firefly, then let it go" type of deal. Of course, that could be a part of the composition too.

And don't hide hands behind spell effects. To most people it looks cool, to me it looks like your trying to cover up for mistakes. And judging from how those fingers look, I'm inclined to actually beleive that too.

The fissure doesn't look all that fissurey. You need to have ripples and rises, like a sine wave. But you also have to show that there was resistance. Some of the sides kinda curve and are soft. Instead go for angles and hard attacks. There is also something strange about it..I can't visualize the fissure. To me it looks like she's casting a mud beam spell. It's like an optical illusion. Just a funny observation.

Lastly, spellcheck.

Good drawing besides these points though.