Hello there fellow RWBY fan ! This is a real nice piece of fan art! Great Job !Okay so I'll try make this more organized for convenience:Positive:isn't stiff so it makes it nice to look at and it fits her character pretty well. Since she has her head tilted up in that position, it gives her that confident character which is very typical of Yang.is very nice and it was interesting to see her like that. It's kind of like a comic book style which Yang would probably fit perfectly in. I also like the contrast of theas it goes well with Yang's yellow color scheme. I also like how detailed theis and how you were able to get that effect with shading.Points for Improvement:Thecould use a little help since for one, it's not uniform meaning I can't identify the light source and two, the shade colors are a bit off which makes it look flat. The hair gives me the impression that the light is coming from the upper right since that's where the highlight is while the rest of her body has a lack of shading which means that the shadow is at the back and the light is coming from the front. You should try drawing a light source before you start colouring so you could keep in mind on where the light is. As for the shades, they appear flat because I think there lacks a contrast of hue. When you choose a shade, you don't just change the darkness and saturation but you can even change the hue. For shades, you can move the hue to shades of blue to make it look more like a shade. When I choose shades, I play with the sliders and do trial and error to see what works. Now for the, everything seems about right except for the cluster of folders on her left arm. Maybe you could try lessen the folds or use a reference. In such case as hers, there would only be that much folds if it was caught before her elbow which I think would be more realistic than leaving it on her forearm. Now for theit's a little too pale for me to actually identify it as Yang's and though the shading is really nice there, it doesn't fit with the coloring style for the rest of the piece. You used bold lines everywhere except the hair which looks a bit bothering for the viewers. What I can advise is maybe you could look at some comic books for reference and see what they do with the hair there or attempt a style that doesn't have bold lines or maybe you could even change the line art colours.I know I pointed out a lot but I only do it when I really see potential with a piece so I hope that I was able to help you in any way and I wish you the best with your improvement! Keep up the amazing work !