You will need:
Harmony Water-reactive dye ink pads:
3D Layering Stencils - City Skyline
Cut the paper at the size of the stencil (8"x8"). Then ink the whole area with the lightest colour, in this case Frosty Jade.
Tape down the first stencil with some washi tape and ink the open area with the same colour, Frosty Jade.
Then put on the second stencil. This time use Green Topaz to ink the open areas.
Then put on the third stencil and the darkest colour, Smoked Emerald.