Loving the empty space displacement between the icon and two facial expressions.
Body pose is static and still simultaneously showing off light vibrancy and subtle sarcasm.
You've got a good handle on anatomy though her stand is a straight pin up and down from head to waist, it still works well with considering the jaunt of the tightly curved midriff to the cut of her sternum being a tad pulled back and rib lines showing.
Shoulder width is nice and even with small slant as well as arm length pushing against the left breast showing that gravity still exists.
Below is a great comparison of facial definition between top and bottom; it's a nice conflict yet still meshes well.
Lastly the typical spatter paint backdrop is a nice added touch to give a bit of more depth.

All in all it's pretty simple sweet and straight to the point awesome; but that's just me i'm a sucker for graffiti art and you definitely capture the street punkish atmosphere without even trying which is pretty damn good. I hope to draw at the level you're at eventually but for now i need to find a computer that wont explode everytime i load mspaint.