To paint on cookies you need a cookie already covered in Royal Icing that has dried for quite a while (12 - 24 hours). If you try to rush and your icing hasn't dried enough the moisture from the paint/water will eat right through the base and you will have an ugly crater. Mix your gel food color with some water/clear extract/vodka in a small bowl or paint pallet. You should use approximately equal amounts of food color and clear liquid (at least that's what I did - someone else may know better).
Aveda Earth Month cookie
The embossing effect looks neat!
This cookie is based off the Aveda Earth Month 2012 poster which is comprised of the drawings of children in India that have benefited from Aveda's association with Global Green Grants. The community now has access to clean water and the children drew these sketches as a "thank you" to the Aveda tribe.