You are mainly missing your shadows and cast shadows. I suggest taking care of your shapes and 3D forms so it is easier to render which and help with the polishness of the piece. You can also just add more details like small hair strands, some textures and more hue shifts to make the piece feel more interesting.
I didn't expect the feedback to come so quickly, I deeply appreciate your perspective on this! And thank you for taking your time to draw over it for me to see. It looks so much better

