Five Steps forward three stepps back
You have shown some progress especially in the face, hands and proportions. However, even though the 2011 is a sketch it does say a lot of where you are currently as an artist. On the 2011 your strokes are short and searching like you are not entirely confident of how you want to lay down your marks but the 2006 version doesn't show this and in fact it shows just the opposite. Your 2011 pose is stiff and unnatural compared to your 2006 which feels more natural and has weight to the pose. Part of the stiffness to your pose is that you are stuck on contour for the body so you loose any structure you may have in mind. Another part of the stiffness is a pose that doesn't show convincing acting and just looks like you posed her. Your 2006 has better acting and gives a better understanding of what the character is about; like she is a quite, coy and perhaps gentle. The best advice I can give you is not to be afraid of drawing through the form, set up structure like the basic armature for the human body and then build up from that. There is an old saying for artists which is: Draw the dog first before you draw the flees. Lightly, build up from the basics and then build over that defining those basic forms into more complex ones.