I fixed up the mug by shading more areas and shapes. Raising the lower rim so the curve is right and thickening the handle at the top and bottom to show the middle curve being thinner means being a lot happier with how it looks.

Using the clumsily sharpened charcoal nib has smoothed it a bit but I might need to whittle off some harsh angles still. I wonder how I'd go blocking in a face.