So... you just snap some random photos and call it a day? I don't think so. I believe every detail in the photo is carefully considered before it's taken and published.
Don't misunderstand me, your outfit is marvelous and very well made, but the bare butt cheeks are only there to give you attention you don't need, because you would have a lot of attention already with the nice outfit.
Sorry, I know that's not a critique but I couldn't help it.
I'm not familiar with the character, but it looks like you did an amazing job on the costume as a whole. The scaled pauldron is really good. Is the design on each scale stitched into it? That had to take some time.
From past samurai/ninja female warriors that I have seen in anime and games, you definitely fit the bill here of being cute n sexy, but deadly.