Dem proportions
Still having trouble with those. I did see that this is practice, and I'm aware of how damn difficult it is to draw from this angle. You did get the angle down pretty well, but you're still having a tough time with the proportions, mainly being the armour. Her left spaulder (our right) is too high and close to her. The chestplate's right (our left) isn't supposed to be the part where her tits are supposed to be; that's her front. What you should've drawn is the side of it because the viewing angle isn't that far to the other side. The legs should be a bit shorter and the feet a bit bigger, because it looks like she's way too tall.
One thing that I don't really like about your works is your line art. It's too simple, especially here, and it stands out too much and kills the rest of the piece. You're still on top of the colour, but it just clashed too much with the lines. Keep working on these things.