Yorkshire Dave
Western Thunderer
A noticeable colour difference to my effort which suggests a bit more work is called for.
This would provide an opportunity to use acrylic paint washes (artists acrylics are suitable). I would start with a very pale brown umber wash to see the effect. If not quite right as a pale wash of burnt sienna. You may have to add a touch of yellow.
It's time consuming as you have to let each wash dry. The washes can be built up until the desired effect is achieved.