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Count each commentary as well as the total. Unequal lengths may be justified; the numbers help you notice where one object may need more explanation or where another carries excess background.
Justification explains why a particular object belongs in the exhibition and what it contributes to the discussion of the prompt. You can begin drafting before every object is settled. Once the set is chosen, review the justifications together so that each object's contribution remains clear and unnecessary repetition is removed.
An 80-word opening uses roughly a quarter of an even per-object budget. Check whether those words establish useful shared context or would be better used to develop an object's explanation.
Place a final comparison where the reader can follow it most easily. It may fit at the end of the third commentary, but that is a writing choice, not an assessment rule or a separate word allowance.
Read each commentary after the cuts. Can you identify its object and context, follow its link to the prompt and understand why it belongs? Restore any essential explanation you removed, then check the combined count again.