This bulls are enormous! I am practising a lot skin painting for WFB monsters, and weathering metllics. Actually it is hardly a challange: 1.very bright silver basecoat 2.wash with reikland flashade 3.paint with dirty water, let say 7water:1paint. best paints are dark browns, oranges and blue/greens. 4.drybrush with bright metallic. 5. finallly You can aibrush a little bit of 'dust’ – vallejo golden brown.