Your forms are generally fine, just need to make some planes of the face more obvious, like the side of the face and cheekbone. Increasing the overall contrast around the face so that it pulls more focus onto the face. Your colours are fine in my opiinion but if you want to push the colours you can always increase the saturation in the focal point of the image (which in this case, I assume it's the face). Overall, you just need to take care of your values and making some 3D shapes feel more solid.

