This one is for my students and our class next week. We'll be working on Complementary colours of Red-Violet and Yellow-Green they go together well and tone (light & dark) in colour.
I peeled one layer off the onion to revel a shiney richer surface. I like the top and bottom of the onion and they were the fun bits to paint.
I painted a red onion in the beginning of my daily painting no.6 nearly 40 paintings later there is a difference! Painting small and often definitely improves your skills :-)