The painting work starts with a very dark layer
to shade the model and allow the detection
and correction of imperfections .
Then i prepare the yellow base coat with a mix of tamiya colors.
I add same amount of clear to give a satin finish
and dilute with a large amount of alcohol
(40% of isopropyl alcohol and 60% of demineralized water).
You can use the black undercoat to create first contrast.
and the final highlighting mix is B with equal part of XF2.
The final result after the highlight work. I guess this is not really the modulation technique. My process is closed to the zenithal figure illumination (light is more intense from top to the bottom). It simply makes the base deeper with contrast and prepare the weathering work.
Next will be the masking stage with silly putty.