I've had exploring brown on my to-do list. I printed out a couple of version of this photo and was amazed at what I saw. Then I picked this flower on my walk a few days ago.
The darkest brown dye I have in my library is called red ochre. It's not a bad match for one of the colours here, but there are all sorts of other browns and reds and golden colours too. Even so, it's probably a more realistic starting point than my surprising tree bark. But first I need to finish off and clean up my primary colours and get some of the candle making out of the way. Thankfully there were plenty of banksia flowers on that particular bush.