Flutes seen from the side

Hi!

I need a simple sketch of two flutes, seen from the side, where in one of the flutes only the first hole (on the front) and the hole in the back are covered by fingers, and next to this, another flute where all the holes in the flute, the ones in front and the one in the back are covered.

I wanted to show that when only the first holes are covered, the length of the vibrating air column inside is very small (it only goes up to these covered holes) while when all the holes are covered, the length of the air column inside the flute is maximum. If this could be shown in the sketch it'd be great, if not it's great anyway.

It's for a guide for a practical class for 8th graders. They will play the flute the way I described for the sketch, note that the sound pitch is higher in the first way and lower in the second and then relate that to the length of the vibrating air column inside. They'll use a Hohner flute: https://musicfactory.pt/produto/3066/hohner-9508-flauta-bisel-soprano?gad_source=1&gclid=Cj0KCQjw7dm-BhCoARIsALFk4v8lDMq3QEhpcryEGL6oUIJDvUL1YnCl64ToU_JFgGEtmar_6_xaqb8aAuLLEALw_wcB#

Does anyone with a bit of free time willing to do it?

Thank you!! :)