Tried to combine shade with texture on top of the inherent tones of the monkey.
Made the shadow tone on the monkey’s body too much darker than the lighter inherent tone, so it doesn’t look part of the same tonal area (of inherent tone). Need to start lighter and build up to avoid this. It made it more difficult to distinguish areas of darker inherent tone.
Maybe I can use the vocabulary ‘inherent tone’ and ‘transient tone’, where ‘transient tone’ means the tone just due to lighting, not the colour of the object. Need to keep transient tone proportional to the underlying inherent tone, and not to dark or too light otherwise it will look like a different area of inherent tone.