Hmm try not to press down so hard with your pencil.. your lines are VERY heavy and dark.. you should do some value bars to get a hold of your pressure control.. after that, your hand should be nice and loose and sketching will come more natural
As for anatomy, in the top one there, where her left arm connects to the body, you've committed one of the first basic anatomy errors most beginners make.. :P ..the arm isn't centered properly on the torso, it looks like it's just glued on to the shoulder blade or something. I suggest drawing from life and doing some figure studies and focusing on this area...
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