No doubt that defined or shapely calves and quads set off a pair of heels and a skirt much better than legs with no muscular definition IMO. (If in doubt, check out vixens previous leg shot avatar or Kronkette's tibialis).
hmm your legs look ok in that pic...theres just soemthing about the one thats not bent, it just doesnt look "right"..i cant place what is odd about it tho. i think it may be the part that sticks out right above the back of the knee...but yeah the tone of those legs are great, but theres just soemthign about how theyre shaped that looks weird..