Don't be afraid to use your friend the eyedropper tool in the name of education! Though it feels like cheating, if you hand/eye pick your colours first, then use the handy-dandy eyedropper tool to figure out exactly how your colours are wrong, you can begin to see colours in pictures more clearly for what they are. It's kinda cool, really. Someone will try tell you it's "Hunter green" and you shout back at them that, no, it isn't. It's R80 G120 B70!
...anyways, yes. Pick your colours by eye, compare them to your reference with the eyedropper tool.
My eyes tell me that you need high-saturation (like 80%?!) orangey-yellows for highlights, dropping fairly steeply to still-high-sat near-reds for the midtones and and slipping into low-to-mid sat oranges/reds for the shadows.