Yellow Rose Portrait (working in series)

yellow rose study oil on paper 12x12

I am experimenting working in series with flower portraits in a square format. I did a few oil studies on paper this month with an emphasis on yellow subjects. What I learned... it is tricky to mix the shadowy side of yellow (Greenish? Grey? Blue? Brownish?) but even trickier when the light comes through the petals. Furthermore while roses slowly open during their session, daffodils crumple and darken toward a more warm yellow in the light and daisies raise and (mainly) lower their petals with no logical pattern to predict and paint and they dance quickly.