Branded social media tile series with ControlNet for layout consistency

I want to generate a series of social media tiles that all share the same composition (so the grid looks intentional) but each one features a different topic. ControlNet will lock the layout, the prompt will swap the subject.

Brand: {{brand_name}}
Brand visual style in three words: {{visual_style}}
Brand colour palette (hex codes): {{brand_palette}}
Platform + dimensions: {{platform_dims}}
Number of tiles in the series: {{tile_count}}
The topics for each tile (one line each): {{topics}}
Composition I want locked (where the subject sits, where the text will go): {{composition}}

Give me a Stable Diffusion + ControlNet workflow:

1. CONTROLNET SETUP - which ControlNet model to use (Canny for hard edges, Depth for soft scene composition, OpenPose if there are people). Tell me what to put in the reference image so the layout is locked: subject in the left third, blank negative space in the right two-thirds for headline text, that kind of brief.

2. BASE POSITIVE PROMPT - the part that stays identical across all {{tile_count}} tiles. Brand style, colour palette tokens, lighting, mood, aspect ratio cues.

3. TOPIC SLOTS - for each topic in {{topics}}, give me the 8-12 token swap that goes into the subject slot of the positive prompt. Keep everything else identical.

4. NEGATIVE PROMPT - one shared negative prompt that kills text artefacts (SD is bad at text - we'll add real headlines in Canva after), wrong colours, off-brand styles, photo realism if the brand is illustrated (or vice versa).

5. ITERATION TIP - what to change if tile 3 of 6 drifts off-palette while the others look right. (Hint: ControlNet weight + colour token order.)

AU English. End with a one-line reminder that headline text goes on top in Canva, not in SD.