its nice, very nice in fact
just dont forget body composition is just as importatnt when only showing a siluhoette, as when the form is well detailed
I.E watch what happens to your shoulder when you put your arm out to the side, the ball joint of your shoulder rises mking the arm come from a diffferent point giving your chest a slightly different shape
also dont forget to keep an eye out for consistency, like if your hoping to make one side of the cape transparent then dont forget the other side
and finaly, what form do you like? and are you sure youve found it yet?, this is an important question we all must ask ourselves, or we risk dedicating ourselves to a hopeless artform
anywho, good stuff