Beneath My Soul

This piece stands out because it is stylized and deliberate. The lack of shading and simplication of line art makes it pop to the viewer extremely well.
I think the only thing I would do differently is to stick to one technigue here. You have no shading through out the piece except for her shell, which disrupts the harmony of the simplification of the piece. While it's good to push your boundaries and experiment, and trust me, I highly encourage it, don't try to throw too much into one work.
I think if you ever revisit this one, try adding detail to her shell as you did to her torso and arm. That area is brilliant and should be pushed further.