Answer:
They symbolize; purity and peace.
Sylvia - Nature (Sylvan = of, relating to, or characteristic of the woods or the forest)
The Hunter - Death/Technology/Civilization
Pine tree - Clarity of Though (from the top, Sylvia is able to view everything)
Heron - purity of nature/rural
Because the Heron continues to stay white in color, it shows that Sylvia stays pure.