According to the principles of sympathetic vibration an artist may enhance the vibrational and archetypal effects by utilizing the attributes of particular herbs. For example if the painting had a solar theme then herbs associated with the astrological sun could be used.
Our physical senses and psychic senses are much more sensitive than we consciously know. Very small details such as herbs added invisibly to your painting as a powder are not missed by the subconscious and higher aspects of our being. The appropriate herbs can totally transform the 'atmosphere' of the painting and can contribute significantly to the effect that the painting has on the viewer.
How do we go about finding which herbs are appropriate to enhance our painting? There are 2 main ways. One is to study the law and legend associated with herbs. Select herbs associated with the kind of effect that you want. The 2nd way is to use your own sensitivity or the sensitivity of a natural psychic to help you select the appropriate herbs.