Certainly an expressive piece, this. The use of shadows and lighting is masterful and works perfectly for portraying this mood. So does the general pose and the positioning of her tail. Even the amount of clothes helps make it more expressive. And, of course, the expression itself. It's a picture done very well, maker.
Don't worry, Twilight, my love. I'm with you. Tell me what troubles you. Or don't, if you don't want to. But no matter what, I want to stay with you and make it all better any way I can. I can't bear seeing you like this, Twily. Just tell me how I can help. Else, I'm just going to hug you until you do.