Hey.
The waist is too thin yet. Even for an elf. Yet the shoulders (though you didn't post a front view I think I am guessing it) are too wide. Specially for an elf.
I am always reading things about mythology, Tolkien and stuff...In the majority of visions of an elf...It's a delicate figure. I wouldn't say the thin arms or legs are bad. They use to be a bit non-human in those parts. But they rarely have rugby shoulders

(I'm kidding, they're not so big) But the waist use to be just like humans. The width use to be almost like shoulders one.
Being the waist and hips so thin, the ass is seen to small, clearly on one of those back shots.
Somehow I have the feeling that legs are too long.
hey, you said needed critique and..sharpenning