1st image I was not very happy with and so the next 3 are of me working on edges at the 2 value stage. Critique and tips on where the edges look odd or lost the rolling form effect would be much appreciated. Obviously any other issues point them out too (like angles of eyes or feature placements looking odd). I can already tell the 4th one isn't 2 values since I focused too much on the eyes and made them darker than the rest of it but that's OK, just a reminder to step back a bit more. If anyone is interested then these drawings are for the Watts Atelier Head Drawing Fundamentals lessons so still a ways to go with these. Still getting used to charcoal and Wolff's carbon pencils. PS: my phone camera makes some images super contrasted and others really dark even though all were taken at same time so sorry about that.
If you struggle with shading then this exercise might help you. Starting with a scale work on graduating the shade from left to right and work on controlling the different shades making sure each box is different to the ones next to them. To get even shade you need a sharp pencil and will need to get in the white spots on the paper. You will also find spots of dark dotted around and you can pull these out with a sharp rubber and refill with the correct shade. Then working with the sphere separate the light side from the dark and place the shadow shape. Then place a scale from exercise 1 onto the sphere and always remember the form and how it bends towards the light gradually. Apply that logic to the whole sphere and work from the dark side toward the light from all the different angles. Again, to get an even shade you will need to be careful with the pencil weight, work with a sharp pencil and get in all of the white spots in the paper. Use a sharp rubber to pull out the darker bits where the bite of the paper has taken too much graphite. I hope this helps someone out there. You could post your progress here for people to critique it if you like.