Hm, I like certain ideas here, but to be (brutally) honest, the build quality here isn’t exactly contest caliber.
Let me start off though with the things I think this MOC has going for it. For one, I actually sort of like your design for the upper arm, the blue one. I also really like the base design for the shield, and the weapon is pretty cool.
But everything else is really lacking, The most noticeable thing is the chest. It sticks out at an odd angle, doesn’t exactly feel like it’s a part of the body (it looks slapped on), and there’s absolutely no flow. The simplest fix would be to just turn it the other way around (if you look at real bodies, they taper downwards towards the hips, they don’t get wider as they go down), but honestly, I think the entire torso needs redone.
The back armor is non-existent, it’s literally just a plate.
The proportions are entirely off as well. The ratio of the arm length to the leg length is actually pretty okay, but the lower arms are absolutely minuscule compared to the upper arms, and the thighs are extremely short too. Overall, her stature here is also more like a Matoran than a Toa, even a Mata.
As I said before, I like the base of the shield, but I have no idea what that shovel piece is there for. It sticks out way too far and makes the entire shield too top-heavy. It would be much better if you took that off.
Overall, she’s also way too simple. There isn’t anything wrong with simplicity, but this is a pretty standard CCBS build, and it hurts the figure. It’s flat, doesn’t have much dimension, and doesn’t offer you many options.
Again, I’m sorry this is a bit of a brutal review. I really do like your ideas, I think the beefed up shield arm is really cool, and your weapons here in particular are pretty good, but the figure needs serious work.