Well first off this is a beautiful piece and very well drawn and I love the way you have the seven demigods. The light sourse is very noticable and the shadows appear perfectly with it. (Sorry thats always the first thing I notice because Im not very good at it.) The contrast from light to dark for the background is done beautifully and the proportions and poses are very well executed as well. The lightning (Im am assuming that is what it is and Im terribly sorry if that is wrong) Is also well done and looks like actual lightning!
Over all I give this a Ten out of Ten.