I found 3 wings on my sidewalk and placed them on my painting. Then I painted them with Mod Podge and now they are preserved in a baggie.
The pot exercise was to save the whites, which I didn't do in the first painting. The colors were important to me, I am pleased with those. In the second painting I tried to save the whites, but didn't get the colors that I wanted, plus the whites weren't natural. I will try again.