I stamped the boy and girl on to watercolour paper with water resistant ink and masked them to add background features and then painted round them with water before adding my Brusho crystal colours. I pushed the colour around with a brush but it only goes to the wet parts of the image: Magic!
This needs to be dried thoroughly with a heat tool before painting in any details or the colours will run in to each other. For the smaller details on my images, I mixed the Brusho colours with some water and painted them in with a fine brush.
Once dry, I mounted this paper on to a card to finish.
There are a few tips and tricks for this in the video I made of the process:
I hope this was interesting and helpful to you. I am sure you have stamps that would lend themselves to these techniques: Enjoy!