Maladie: You should be proud of where you gotten so far. It looks great, and you’ve got a good solid grasp on the skintones (yours is a tad pinker than the original, though). Nice values, too. Oh, and lovely job on the water. 
The only thing that’s really standing out for me right now is her face - it’s rather small. If you can, size up the face, and then give her that lovely smile she’s got on in the original.
Looking forward to an update.
aggie93: What you’ve got there looks really good; nice values, nice shading technique (it looks like you’re hatching?). But, you’re rendering in parts. If I might make a suggestion, try laying down values on the whole before working up the details. It’ll result in a much more coherent final result. But I’d like to see where you take this. 