He also was a pioneer of dot and lozenge technique, where dots are placed in the middle of lozenge shaped spaces created by cross-hatching to further refine tonal shading.
It was the first tonal method to be used, enabling half-tones to be produced without using line- or dot-based techniques like hatching, cross-hatching or stipple.
His use of hatching (parallel lines) and cross-hatching to depict shading and volume, steadily grew more sophisticated and his figure-drawing became more confident, sometimes overconfident.
