I'm not concerned with what's in the 'how.' Art must convey an atmosphere. The nine Indian 'rasas' (love, joy, wonder, peace, courage, sadness, anger, fear, disgust) are essential
energies that define a set of emotions. It's important for us to have this in mind when we look at art. If none of these emotions strike you, then all you have left is simply seeing the artist's technique. If admirable technique is not even present in a work, then there is nothing at all. Vincent Van Gogh was not much of a draftsman. But, his emotional intensity over-rode this missing capacity. He was labeled vulgar and crude by the fine art academicians of his day. Artists are either masterful or mediocre. Styles are as infinite as those of personalities, like one's handwriting which is strictly their own.