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Just like lighting too much shadow is also bad for a headshot. We know shadow increases the authenticity of an image but if you put excessive shadow it can harm your image also. The viewer of your picture may assume you’re trying to conceal something from the actors in front, if there are too many shadows. So, you use shadows just as much you need.
Images that are blurry are not considered technically proficient. If the image has blurriness, the headshot is useless and will establish as a bad one. Note, if you want a truly professional headshot, the technical information must be excellent.
Poor framing will take all the positive from a headshot. If you give the customer too much or not enough in the frame and cut off the head, it will be a bad example of a headshot. Learn the right techniques of framing and try implementing them in your photography.