And then there was 'Light!'

The final stage is building the transition to light. I  put down a dab of the brightest colour  in the focal point area. This helps to decide on the range of value needed throughout the piece. The transparent under painting will be left untouched  in areas. This will make the  opaque transition appear brighter and livelier creating vibrancy. I let the painting dry at the tacky stage and then go back in and glaze transparent darks or colours to enhance or change value where needed.
Thanks Perry Haddock for sharing your photo!