Well
I honestly thought that this person was a male until I saw your reply to SCTE3's review. Seriously, it looks more like a man in more than one way. I'll elaborate later.
So, let's see!
There's an assassin who I originally presumed was a male due to the white skin and the lack of hair, with darkness inside the hoodie. The assassin concerned has a rather fancy top, with a large collar, like typical assassins, or at least ones that reminded me of the ones in Assassin's Creed. (I never actually played the game :p)
I like the shading you've given to the collar, which is a gradual gradient from black (from the hoodie) to white (outside). The only problem is, I don't know where the light's coming from. It could have come from behind the person, or from ahead, or there could've been more than one source, but I only see a few shadows, none under the collar!
The hoodie that the assassin is wearing is drawn nicely, and the darkness is also accounted for. Oh wait, that's hair? Is it? If it is, then I doubt it's as good. The hair is almost invisible, because I can't see any individual strands!
The assassin is a male. Cross that out, you said it's a female. It seems that you made a mistake there, because it looked like a male on the first glance, and when I looked at it closely. The expression is neutral, the eyes are lowered down, no visible eyelashes, some thin eyebrows and deep gashes above. I'm going to assume they're gashes, but if they're not then you're in for some more trouble :p The nose is drawn nicely, with some shading here and there, but...it still looks male! Looks like you need to practice female anatomy bro :x
The shirt/top/whatever on the other hand is drawn quite nicely, and I like the curves you've drawn here and there in a different color than the shirt's to show contrast, and a slight band on the left side. There's a slight necklace with a small symbol, and it's drawn nicely, although I don't think that does anything to show that it's a female. I've seen some men wear that :x
The background on the other hand, though, is a little dull, it's just light brown. I mean WUT? Just light brown!? There's so many possibilities, a cityscape at the back, showing the assassin-a at the top of a building, and a skybox at the top, but not a solid color background!
I'll conclude the review with this statement: All in all, a good piece of art, however I do notice that it's not as good as could've been.
~~ Summary ~~
~~ Good points ~~
1) Good detailing at parts
2) Nice shading at parts
3) Nice drawing of clothes
~~ Bad points ~~
1) Light source position unknown
2) It's a female? Looks more like a male :\
3) Dull background
4) [If hair] Hair drawn badly behind hoodie
[Review Request Club]