A couple of things. I like to have my students to return the plane to straight and level and take their hands off the sticks after each turn. It shows them if the plane is properly trimmed it flies on its own and helps them relax for the next imputs. I also like to have them do a half a dozen loops their first flight. I started doing this after a buddy of mine and I let 50 or so kids fly our planes at a summer camp my daughter was in charge of. Most of the kids just hauled back on the stick, but some quickly recognized that they could fly the plane around the loop by varying stick imputs. If your student does the same you know he/she understands what the plane is doing and you can skip some of the whys in the lessons.
Also I always tell my students what my instructor told me almost 40 (cripes) years ago. "No matter how well you fly, it is your landing that everyone remembers".