hmmm, I think the design can be improved if you repeat certain patterns instead of always coming with "something new". What I mean is that, for example you have a really strong kind of helmet design, but it won't be as effective if you just stop in the head, for a better design you want to repeat patterns in your drawing, so, your helmet is a pretty good choice if you want to keep that strong design more than just in the face. And what I mean for "something new" is that I see at least four elements that visually represent your character.
1st. The mask or the helmet thingy.
2nd. The cloak.
3rd. The armguards, neck thing and possibly the belt? (I think they match)
4th. That thing below the belt.
So what you want to do here is develop each design element so you can "spread" it in the character, and therefore having a better and effective design that doesn't look like a mix of random design elements. (I'm not saying it is but if you keep adding elements to the drawing without having that in mind, then it will suddenly become a frankenstein design very hard to look at)
Here you can see I'm using the helmet design for his shoulder thing, and I suck at painting metal so I left it there. But you can keep developing those design elements in a much more better and creative way than what I did, that was just a cheap example. Also, the messy purple line is where you could place stuff, is just a "blank space", and you could use that part in your advantage.
I painted a few things too so you can see that you need a bit more of contrast, specially in the torax and arms. That's all I could help with ^^
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