Good progress, but right now it lacks clarity.
You've set a general light source (top left), try to see where it extends and everything it affects.
Try to use a full range of contrast. I've included full black in there.
This is a great example of a white background skewing your values. From now on, don't work on a white background! It does you absolutely no good. Stick to neutrals.
The hair has 5 shades, all within a very small value range. The entire head suffers from low contrast, making it very hard to see anything.
You have darker values. Use them. Shade the face according to the light source. Check your anatomy.
Another tip, blonde hair is light and thin, so would be unlikely to create a shadow at the hairline.
I didn't touch the pants but they need reworking, it's a lot of noise in what looks like a lack of understanding of the form. Study from your reference how it works.