You've got a very promising design and I'm sure you'll do a killer job on the coloring.
I've got a few nitpicks regarding the line-art that you might want to give attention to before you spend any time rendering it out!
I found that there was something lost in translation between the initial pose sketch and the finished line work, and comparing both I find there are things that worked better in the sketch.
First off, make sure you do not lose head height - the eye-line is roughly in the middle of the total height of the head, so push that hair outline up!
The cross-contour lines (i.e. the lower outline on her shirt, the belt, the knee-pad sleeves, etc.) help indicate the form of a volume by giving the brain the context it needs. These lines are supremely important and should not be neglected - make sure you check out the knee brace top and bottom outlines (they should match the cylindrical shape suggested by the thigh-belt).
Give a second check to that hip-bone anatomy, simplify the curves and triple check the pubic area. From the overlap of the legs, it will be mostly hidden by the forward position of the leg. Less is more.
Finally, look how dynamic and balanced that foot position is in the sketch! You should keep that! I suggested a boot position that's closer in spirit to that original sketch.
That's the essential stuff I came up with, keep in mind these are suggestions and to be taken with a grain of salt. Looking forward to see how this piece turns out!!