Parameters are controls, not decorations

Midjourney’s current documentation places parameters at the end of the prompt. Add one only when it expresses a decision in the brief: aspect ratio for placement, tile for a repeating pattern or a recorded seed for a controlled comparison.

Need Prompt decision Review
Website hero --ar matches the layout Test responsive crops
Pattern --tile requests repetition Inspect a repeated grid
Style comparison Hold subject and composition fixed Change one style variable

Do I need every Midjourney parameter?

No. Most first projects need a clear visual description and an aspect ratio. Learn another parameter when a real constraint requires it, then verify its current behavior in Midjourney’s documentation.