Untitled

The first thing that caught my eye was the shading. I tjink you did a pretty good job on that. And you also have got most of the proportions right. The only reason this doesn't look quite accurate is only becausw of left eye. It is too close to the nose. If you draw a line from the corner of the eye to the corner of the nose you will see that the line is not parallal to the nose bridge. A good way to know if you drew eye too close to the nose is that the line connecring the corner of the eye and nose together should be in parallal with the nose bridge, when you are doing a 3/4 portrait