Assasin/rogue style character help please!

[EduardoGaray]

before you continue rendering, i suggest you to redraw the pose because the anatomy is off, and thats essential. If the base drawing is wrong, then it doesnt matter how well you render it or how awesome the design is, it wont look good.
Use reference, take a look at some anatomy books, and construct first the figure, then add the armor.

For the design, just avoid dumb things like chestplates with boobholes or stuff like that, you can make a female look sexy without all that lame stuff.
I actually like the scarf she is wearing! why not bright red to complement all that blue and purple?
But if she is a sneaky warrior, ninja style, then you should avoid bright colors, and use black or dark earthly colors, or even camouflage!
It also looks like she is a very agile combatant, maybe with an acrobatic style, if thats the case, then desing an armor light enough to do those acrobatic moves and without any unnecessary ornament that would interfere with her figthting style.
Also thats a very big sword, does she have enough strenght to use a thing like that?
Maybe a shorter, smaller katana like sword would be more appropiate.
Cheers!