Great sense of motion and color in this piece!
The biggest problem with it is that compositionally there are two strong characters featured in the center and it's not totally clear which is the main one. There's a note on the FAQ about this: "It doesn't have to be just one character, but it has to be obvious who the 'hero' is! You can include side/support (or enemy) characters in your concept sheet/illustration." One could argue that the sorceress is front and center and clearly the main character, but as you're still early in your development process, you might consider how to make your illustration showcase your sorceress more and her summons less. Good luck either way! 
