Good, but your legs need some work.
I think that the image as a whole is more than passable, representing a very accomplished work of art, perhaps lacking in the background department, but other than that, you've made a good stab at it and have given us something very interesting to look at.
The legs look to get a little thin, below the calf muscle, tapering almost to nothing before entering the boot, which is not how a human leg would look - sure, it would taper, but exaggerating this does not give us anything, nor does it serve to accentuate the size of her calves or thighs...
Further to this, the toes of the boots look massive, while the body of the foot looks rather tiny, pointing to some sort of deformity, perhaps club foot... Always remember, the legs are going to be proportionally bigger than the arms, as you have to use your legs more, thus building the muscles more than the arms, unless you go to the gym and pump some serious iron.
Simple lines, good colour, good shading. Keep up the good work and see if you can give us something more to go at :)
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