What is the difference then between, say, political practice and artistic effort? Essentially, i think, it is to do with motivation. The politician wants to change things - the World! - whereas for the painter, etc, the effort is pre-motivation.
Another essential difference is that artistic effort is subjective and experiential.. and in this lies the rub - how can work be subjective nut not egotistical (for this latter is a denial of "artistic")?