Howdy! I think Mac did a good job with that wonderful pose you built (go Senshistock!). So, I'll focus on something I'm noticing with the face. Make sure that all of the facial features are drawn at the same angle as the entire head! Here, I noticed that the nose sort of looks as if she's facing more towards us, while the angle of the head as a whole is to the right and tilted slightly downward. Remember that the nose has a distinct top and bottom plane, and two side planes; especially at tricky angles, try and lay in a simple 3D box first to get the angle, then carve in the subtleties of the nose anatomy on top of it. Start with big shapes, then work into the small ones. Proko has a really good lesson on the nose that I just watched today, actually. You should check it out! Meanwhile, the right eye is too close to the right edge of the face, and the tilt doesn't match the rest of the head (it's too straight). The corner of that eye should actually be pretty close the other side of the nose, just like the left eye. Notice that in the reference, the curve of the brow is even overlapping it a bit! Personally, it helps me to lay in the frame of the eye socket with the brow ridge, nose, and the top of the cheek before I draw in the eye to make sure I'm not skewing or flattening the face by accident. I did a quick paint over to try and show what I mean. I hope this helps!

For breast placement, they should be 'pulled up' by her raised arms, where in your image they appear to sit in their natural relaxed state. If she is running they probably also wouldn't be sitting quite like that, but you could argue artistic license in not drawing them affected by her movement. For the lighting, how intense is the fireball (?) light intended to be? Currently it appears quite a soft light going by the lit areas of her body, rather than a bright, sharp light. See for instance in this image how brightly lit the guy on the right's forearms and back are by a fairly small light source. Yet... as I quickly browsed for similar drawings online it seems a lot of artists go with softly lit, so perhaps it's not an issue :p

Hello there, well done with your sketch. I can tell you have experience with figure drawing. There are some critiques that i feel will make the pose better. I think most of the issues are surround the clarity of the spine. first off, the legs both looking like they are in side view (atleast the feet are). This means its difficult to balance as well as the legs to pelvis to rib cage doesn’t quite flow. The legs cannot abduct to a side view when the pelvis is in this position.The pelvis and rib cage are similar rotation besides the rib cage is rotated in the z-axis which makes the lumbar section of the spine not make sense. The neck doesn’t seem to erect from the rib cage. The tail also comes from the spine as well. Also with her left hand the middle finger seems to bend into the ring finger which doesn’t seem very natural. one more thing having both legs on the ground doesn’t feel like she is running. Try having one foot in the air I’ve included a draw over and a quick-sketch I did trying to be as truthful to your original pose as I can.