Edit: Fixed the rendering issue with the cutie mark! The corrected version has been uploaded. Enjoy!
No credits necessary! If you do use this, I'd like to know where, but again, that's entirely optional. Because I've had some issues with art theft, please note, this does not include posting the art to your account without any modifications. You may not post this and claim it as your own if you do not modify it in some way (you don't have to modify the vector itself, just don't re-upload the original without anything else. Album covers, for example, are acceptable, even if it's just the vector and some text). Be original and add something to it if you want to post it on your account, otherwise, I ask that you link back here if you want to share it.
Other than a missing line on her cutie mark (on the cloud outline), I think the magic cloud's opacity should be low until it reaches the first edge. Looks great.
I think I've found the settings I need to make the magic's gradient properly and I still don't know why the cutie mark is getting cropped. The outline for the magic doesn't look quite as transparent as it is against the green dA background. I'll see if I can find a better reference for it and get that right. And thanks!