I think what would help you is having more of a contrast between the lights and the darks. Your shadows seem more like halftones to me. I would push the darks more, and even darken up the nostrils a little more. I would also focus more on the structure of the nose and try to get the shapes down a little more accurately. You're doing good, just keep practicing mindfully and deliberately and you'll see improvement! Hope this helps ;)
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