Supergirl

First of all, I very much like the colours on this piece, especially the stark reds and the blue (particularly on her arm). The white lineart of the smoke is also a nice touch though a little more scattered towards the back. It's also difficult to discern where the smoke is blowing away from as the separating streams of smoke below her leg seem to be layered and spreading in different directions, which doesn't entirely make sense but it's a minor thing, honestly. Although, it is made more noticeable by the blowing of her cape and hair, which the smoke should, realistically, be blowing in the same direction of.
That's something I should note as well; the lower sections of the hair and the cape flow beautifully, and I especially like the weighted look her cape seems to have around her shoulders. However, longer hair tends to be more heavy because of how much there is, so if the wind were to be blowing so much of her hair it should technically be blowing her bangs as well, which would be less weighted and therein wouldn't offer up as much wind resistance.
The most obvious point of criticism for this piece would be the anatomical accuracy, which is (sadly) something I noticed from the thumbnail of the piece.
Supergirl's head is not only a little too small for her body, this is made more evident by the mismatched size of her hands. Her right hand [image left] would be larger than her head if her fingers were unfurled, and her left hand [image right] is perhaps the right size for the size of her head, but it's jarring when compared to her other hand. Her left arm [image right] also suffers from this. I understand that the intent was to reduce the size of the arm that would be in the background, but the pose presented here doesn't offer enough of a difference in perspective for the hands and arms to be such obviously different sizes.
Additionally, her torso is abnormally long. This can be seen prominently by the placement of her breasts and her waist which should be as low down as the middle of her upper arm and her elbow respectively. This exaggerated elongation also means that her lower pelvic area is at the same height as her resting arm, wherein her arm should actually reach down to her thigh.
As for the face, her nose is a little large for how she's normally portrayed, though I understand that might be a style choice, but her jawline is a little too pronounced for a woman as young as she is typically shown to be.
Overall it's a nice piece, but I would suggest focusing more on anatomical accuracy in the future as it will help you in drawing more dynamic and interesting pieces and poses.
That's all the critique I can offer up at the moment.
Hope it was helpful~