Nice, you're getting there. The general likeness is off. You might want to work on that a bit, but the model itself is improving.

You should try to gather more reference of the person you're modeling. Shots from different angles. Not too many, as they will just get confusing, and you'll never match the forms in every picture, as the person's expression will change, the lighting of the image, the age of said person may change, along with other things. But generally you want about 3 or 4 images to work from. Try to match their key forms and how they fit together. Then work up to the unique details.

You should have likeness at one or two (at the most) subdivisions. This will let you know you have the key forms down, after that, it's just refinement and details.

Nice work!