My DD8 is taking art lessons that teach a classic art composition technique that involves drawing a grid on the canvas and composing the picture by the grid. It is a painstaking process but one that many artists through history have studied and used. Her school art teacher told me that Picasso, for example, started out with extreme realism within a grid and developed cubism from that.
So far DD's studies have not affected her sketching and drawing except that her freehand is much more detail rich now. Modern and post-modern art have favored self-instruction rather than classical techniques.
There is no right answer in art, I suppose, just a search for some kind of truth by the artist through the medium and technique that speaks to them. If your artist is stifled by technical composition then it's not right for her but my DD 's art has been enriched by studying classical technique.
