This exercise is about developing form as much as it is about colors. It was a busy night so I only got in a few preliminary layers but I did learn about brush handling. My fine-tipped Series 7's can certainly lay down a fine line and yet can behave like knife edges, cutting up the tempera if I absentmindedly go over a wet surface. Spreading the bristles with my fingertips to create a flat works very well. Perhaps I should look around for a few flat synthetics for a try.
And please do check out a most heart-warming post published this evening on the NESBA blog. Botanical art at its best, I think.