I am very impressed by this drawing. You have come a long way since I first noticed your drawings, and you are constantly improving even though I know you don't see that yourself. But trust me, you are improving by each and every drawing, so never give up on this awesome job you are putting down into your art.
What I really like about this drawing is the face. The expression is easy to read, and it transforms into the pose as well. You've done a great job with it. The arm cannon is also very well made, and it's easy to understand that this is one dangerous and powerfull lady. I also like the glowing parts on her body. They are not overly glowing, but they are just perfect in the way that the viewer understand that they are glowing. The legs and feet are just yummy, enough said! The same goes for the shading. I like how you have used a mix between hard and soft shades. But maybe you could try to add darker shades some places. Like, between her legs, on her upper right arm etc. Just to make a bit more dept to it.
What I think could need improvement is the background. It's very well made, but I think the perspective line is too high. Try to lower the highest part on the picture to make it more straight. I think that would fit more because of her pose. The waistline and butt could also need a little fix up. I think her waist is too high, it kind of looks like she don't have any ribs. And because of the high waist there is also no butt. Try to seperate the waistline with the thighs to give a feeling of shapes. The last thing I want to nitpick on is the tail. It looks like it's coming directly out of her back, so try to lower it a little bit.
All in all, you've done a great job on this, and you never stop to impress me. You are constantly improving and I can't wait to see what you'll give us in the future!