A quick sketch made after a sailing lesson can become confusing when boats, pontoons and lines all receive the same kind of mark. Separate the things that stayed in place from the things that moved during the exercise.
This is a debrief drawing, not an arrival plan or navigational aid. Start with the fixed surroundings as you understood them at the lesson: pontoon edges and a clearly labelled viewing position. Add the boat in a second colour or with a different line style.
Draw moments, not a tangle
Use two or three small panels for successive moments instead of laying every position over one diagram. Give each panel an order number. An arrow can mean movement, a pointing gesture or wind direction, so label its meaning explicitly rather than letting the reader guess.
Beside the drawing, record one instruction you want to clarify with the instructor. Keep uncertain details dotted or marked with a question mark. Reconstructing a confident-looking manoeuvre from incomplete memory can conceal exactly what you still need to learn.
When you return to the lesson, ask the instructor to correct the sequence. Preserve the correction rather than silently redrawing the whole page into apparent certainty.
A successful sketch should let you describe your question in thirty seconds. It does not need artistic detail, and it does not replace a briefing for different conditions or another vessel.
Editorial illustration from this site’s image library; not documentary evidence of the example or object discussed.