This one is completed from within the monastery.

You will need to open a set of shutters for it.

It's on the rightmost "window" revealed by the shutters you've opened.

Go inside the monastery. Open up the leftmost shutters using the puzzle with the small red tree.

You'll need to stand in the right place so that the yellow gourd is visible as a circle through the space in the upper left of the chalice in the rightmost "window".

Here's the part with the tricky timing:

Use the small red tree puzzle to close the leftmost shutters, then quickly start tracing from the yellow gourd. Wait at the bottom for the shutters to close, then continue tracing rightwards and upwards.

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Open up the set of shutters left of the entrance.

What can you see that might work as the start of the puzzle? What might be a possible line?

How are you going to close the gap between two of those lines?

The answer requires a little tricky timing.