How to Explain and Diagram a Sound Instrument Project?

[instrumentphy]

So I have to make an instrument and write a report but I'm stuck on the report.
It says to
-Uses all the wave unit vocabulary correctly(things like frequency,amplitude,wavelength,type of waves etc.), at grade level, and specific to your instrument. eg. standing wave, damping
and
-Includes hand-drawn explanatory diagrams.
The project that I made was with metal cans of different size.
The other project that I made was a panflute made out of straws in different lengths
How would I explain it? What kind of diagrams should I include?

Thanks in advance

 

[Basic_Physics]

http://www.physicsclassroom.com/class/sound/u11l5a.cfm