Raw Umber and Trans Yellow on the lighter brown areas mixed with a small amount of cobalt to cool it down.
A little Manganese Blue Hue on the hightlights.
Build up in layers of Permanent Rose picking out the edge of the prominent veins.
Add some Indanthrene Blue to the Perm Rose for thee more puple hues then add neutral tint mix to this for the darkest areas. Finish off using some dry brush to accentuate the veins, leaf edges and blemishes and model the surface using the same colours to create more form. Finally added a bit of Burnt Sienna to lift some of the browns.....and that's it! ...until tomorrow.