I love to paint sunflowers. I have done a number of pictures of sunflowers and never seem to tire of painting them.
I learned a neat thing from Homer Allbritten, an artist friend now deceased, about using a “mother” color. He said to add a single color in all mixtures throughout the painting and this would easily achieve a unifying effect. I don’t think I always do this, but I am more pleased with my paintings when I remember to do so!