I like the style and the octopus theme. The glossy look adds to the octopus hair, and really makes the face pop. While the long torso is not atomically correct, you can tell it's more of a style choice rather than an error.
Some things I think could change is while the long torso suits the image the large arch seems wrong. While I find stylized back arches appealing there are some things that make it look off. I don't know about most people but the more I arch my back the harder it is to stick my head forward. Her head is both forward and has a long neck which I don't think works. Also the back line and stomach lines don't match up. While at that angle they wouldn't be perfectly parallel I don't believe the back line should be so curved. It almost looks like a bite was taken out of her and a piece of her is missing. I also feel the belly should be more lined up with the the collar bone and more to the viewers left to point out how the belly is sticking out on one to arc the back. Also I feel the face should be longer since the chin is to close to the mouth in my opinion.
tl;dr: The back arch is too much and there should be some more chin.
