The idea is to encourage an artist to see things differently, to open them up to other possibilities, to change the way they design their paintings. It's not an easy thing for them to do. Although many students are looking to grow and learn, which is why they sign up for a workshop, or do art mentoring, many have developed ways of painting that are easy for them to do, that feel good.
I like to challenge students in my workshops. It isn't easy. I encourage students to paint with their heads for a couple of days, learning about structure and design, a shortened version of what artists were required to do in the days of Ateliers. This was the classical way of learning to paint and draw, just as a musician learns scales, and how to read music before they can play. For the remaining days of my workshop, students are invited to play, to work more intuitively, to incorporate head and heart into their work.
I hear good comments about my workshops: how they change the way people work, change the way they see, and even, change their lives. But many of these artists, then, soon after, instead of slogging it out in their studios, finding their own direction, get discouraged at the work involved and go on to another workshop where the focus is different. They work in that style for some time. And they may go on again to another workshop and yet another. Gradually, with all the confusion of different teaching styles, they often end up going back to working the way they did before any of the workshops.
It's difficult to grow and change. There has to be strong commitment behind the intention. The hard work needs to be done in the privacy of your own studio/workspace, where you struggle alone with finding your own voice.
It's also hard to commit to change when the artist posts their older work or unfinished work on Facebook where they get a few 'likes', or they sell a piece of the older work. While that can be rewarding, it also encourages stagnation and the effort required to grow and move forward dies.