I like the tones used, but there’re a few things which irritate me.
Firstly, the pose.
I’m confused as to what she’s meant to be doing….she seems to be floating somehow (probably, because the artist has trouble foreshortening feet and so didn’t want to draw her standing on something) and her knees (which are rather tiny) are stapled together.
Also, is she surprised at something? Perhaps she’s shocked that her right hand is a weird colour, or she wasn’t expecting her cloak to stay on because it’s not attached to anything, it’s just sitting on her shoulders. Maybe she was expecting to have some arrows on her back which is why she’s reaching behind herself (although that would still look slightly weird as her fingers would probably be placed differently)? Or she just has an itchy back? Perhaps she’s puzzled as to why her bow isn’t steady enough, despite her best attempts to make a hand sign with her middle and index finger, rather than simply wrap them around her bow for grip.
Now, the second thing is the outfit.
I don’t have much against the outfit, although it does seem to be designed with sex appeal in mind more than practicality, but I’m not going to complain about that because there are other people who can point out the flaws far better than I can.
The main thing I have a problem with, is that she has greaves, but no other form of armour (unless you count the shoulder pads and bracelets, which I don’t). My advice would be to either remove that, or add armour elsewhere (but not something like a chainmail bikini, I mean something that’s actually practical rather than just shows off her boobs and/or arse) . Unless she’s really paranoid about being kicked in the shins more than she is about being, say, stabbed in the chest, then she’d prioritise wearing chest armour instead of greaves.They’d just slow her feet down and be heavy, whilst offering very little protection. If it turns out that it’s actually a very light and/or magic form of armour, then there’s still no reason why she shouldn’t have a breastplate and/or helmet.
Also, I doubt she has enough strength to draw back that bow, although I have a feeling that’d be explained away by it being a magic bow or something like that.
[Edit] Now I feel bad because this might be a bit too harsh of a rant, and it is fanart, so my rant about her armour is a bit obsolete, because they probably had nothing to do with the design (although I hear that apparently a lot of League of Legends characters are made by fans). Ah well, I still felt it needed to be said.