Acrylic on 40cm x 60cm Canvas
Botticelli "Birth of Venus" detail
I usually just launch into an acrylic painting freehand, but with a masterpiece commission I'm a little more cautious. First I mark the canvas into about 16 squares along the edge with a neutral mid tone color like raw sienna or yellow ochre. Then I paint a main outline using the sections as a guide and paying attention to negative spaces.
More tweaking to the all important right side of the hair.