Thanks for all the comments guys.
Rocks are painted in a dark green - sky grey mix of acrylics. Then washed with mix of dark green - prussian blue oils. Dry brishing with buff - sky grey mix of acrylics. Then wash with cassel earth - ochre mix of oils . And finally dry brushing with buff - light grey acrylics . of course you need to bake a bit the oil washes till theyre dead on dry , other wise your acrylics highlighting will end to a mess . I use the oils in washes cause they give a slightly polished taxture that bear water rocks usually have . At least thats what i tried to do
John as for the book the truth , is that i have the proposal and i have started making the material , but slowly i guess..i want to do it nicely . Will take some time . I hope not that much .