That's how I would interpret the term "attribute" but by all means ask around!
So with the 2 things you have mentioned (writing and shot composition) - these are part of the evidence.
Shot composition - attributes relating to this might be well-developed visual sense, or knowledge and understanding of cinematic camera conventions - then point to the evidence to prove this - such as a sequence where you demonstrate your experience and knowledge of shot composition.
Writing - attributes might include familiarity with screenwriting conventions and formatting, or working knowledge of narrative conventions - then point to the evidence - such as an example of your screenwriting.
Good organisational skills can be evidenced through things like producing a film, doing production management on a film, organising an event (eg a screening).
We're not talking about personality traits here - we're talking about skills.
If you're not comfortable with this approach, then you can always just list the "things I can do" with examples to illustrate.