The shading is smudgy. That is, it looks more like smeared dirt than actual shade. I agree with earlier comments about the placement of the eyes, ear, lipline, etc. It's mainly about the distance between all the features on the face. The difference between eye and ear, for instance. The left eye looks a little large or the right too small, the ear isn't proportionate, but mainly it comes down to measuring. Use a photo for a source material and measure everything.The length of the nose and the size of the iris in the eye, for instance. You'll soon see where you got off track.
.please criticises this drawing so I can learn more from you . 10x
It is a poor escuse for a picture but I don't have the means for a better one :( (don't know to right that well in english . sorry)