First, I would export the project at a higher resolution than I supplied before. I would make a production quality PDF, or in this case, re-save my sample in a different manner and at a higher contrast.
Next I would push the saturation and or contrast even more. Increasing the saturation didn't help, but upping the contrast produced a sunnier result.
Third: create some contrast via adding a different color. Here I used a darker brown in various places and added a black border.
One more: bring in a blue to contrast with the sunny color.
Which would you choose? Which ones would you present if you could only present two?