Oh I disagree VL, Fishnets are a wonderful thing! They offer texture on otherwise silky smooth skin of the female leg. It is that double texture that drive me wild! Oh wait you were talking about drawing them...OOPPPPS my bad
Honestly, this is a beautiful piece of work! You gave the fishnets definition with the light shadowing, and from my experiance with female legs in fishnets, the lines are not symetrical, due to the curves of the leg the lines are not completely straight, you gave this a very believable and awe inspiring look to some great legs!