I had a student playing a piece in G-major, and I knew he wouldn't remember his F# in the key signature so I wrote a giant F# and put a box around it. He came back the next week without any F#s in the piece. I drew a circle around the F# and put some big arrows pointing toward it. The second week: nothing. If aliens had discovered this page of music by the time we were done with it, they'd assume that we worshiped some sort of god called F#.
Simple pencil marking just don't cut it sometimes. Why not use a sticker to create something eye-grabbing, fun, and possibly even relevant to your point.
|"Play strong, like me!"|
|What better way to tell a student to slow down than with a giant-eyed turtle?|
|Threats of extinction are always effective|
|Let's ignore the fact that my student chose to write a bunch of note names in and instead focus on the glorious use of an advice sticker.|