YouTube Thumbnail System Prompt

Prompt

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Design a YouTube thumbnail system for [channel name], a channel about [topic].

Requirements:
- Thumbnails must be instantly readable at 168x94px (mobile browse size).
- Create a consistent visual language: face crop rules, text treatment, background style.
- Maximum 3-4 words of text per thumbnail, set in a high-contrast treatment.
- Show 5 example thumbnails demonstrating variety within the system.
- Include an A/B testing framework: one emotional variant and one curiosity variant per topic.

Return:
- thumbnail system rules
- 5 example thumbnail concepts
- face and expression guidelines
- text and contrast rules
- A/B testing framework

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