I worked on your feedback. I redrew the skeleton and worked on the construction shapes.
In regard to the final step the line art I added value flat colors to it, but I will not render it, because I will focus more on drawing than painting.
1-Could you please check the skeleton and the construction shapes?
2- Could you please check the last step and the values? I worked on the face and the beard!
3- In the final drawing I feel the Trapezius muscles where the neck area looks wrong!