Only saying...

Sunlight comes from a orb that is half a degree wide.
This works out that sunlight passing a sharp edge blurs out by one inch to every eight feet. (Distance Sun to each / Sun Diameter = 109.1).
Your Garden/Sunlight is almost spot on.

...just add in the specular and diffuse reflections of sun, garden, dress and floor.

Using Xara with multiple layers as a virtual light box is far more intuitive.

Acorn