I use acrylic paint for the white part...but for this one the commissioner edited it in photoshop. She wanted to make it look more accurate and i gave her permission xD;
I use gesso white a bit, and if I can get away with it white gel pens/white prismas, though I'd never usually tackle an area that large! The photoshop fix was a great idea as I tend to impliment photoshop quite a bit.
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