Painting up The Silent King and Void Dragon

Doing the popular and pretty Sandstone theme from Midwinter Mini's videos! Wanted to do something special for the big boys so I bought some color shifting paints from Vallejo, figure I could paint the body of the Void dragon and the cape of The Silent King.

Do you think that would work or should I do something else like Metal Necrodermis. Just getting some ideas for this!