I tried to write a colour poem for yellow myself, but gave up as I did not think I could do the idea justice. I am so glad now that I did not because yours is perfect.

I admire the way you set the scene with the sun, flowers and then the jaundice. And the poem works so well as a whole. I especially like the last line, which of course also suggests that awful yellow mask Mrs. Munro got her daughter to wear.