How to use it:

I recommend this Providence - 2.1 - 1.2 - Anchor | Stable Diffusion Checkpoint | Civitai

because it was trained with it on 768x768

Works better with complex prompts.

Prompts: 90VHS, vhs still from tv, vhs from documentary, vhs commercial, ((yourprompt on VHS style image like 80s)), ((high quality:1.2, masterpiece:1.2)),high details, detailed and intricate, intricate details, high intricate details, absurd amount of details,((upper body:1.2)), portrait, Realism, Ambient Occlusion, Natural Lighting,Volumetric Lighting, Volumetric Light, Volumetric

Negative Prompts: rz-neg-foranalogportrait, Neg_Facelift768, cartoon, 3d, asian, ((disfigured)), ((bad art)), ((deformed)), ((poorly drawn)), ((extra limbs)), ((close up)), ((b&w)), weird colors, blurry

Neg_Facelift768 Download

I recommend these parameters:

LoCon Strength: 1.0
Size: 768 x 768 - Truly I have not tried with other resolutions, I think the most stable is this measure.
Sampling Steps: between 20 and 40 is the most stable.
Sampling Method: DPM++ SDE Karras works very well for portraits.

Using this LoCon in img2img interesting results are achieved maintaining 512x512, and with these settings:

Same settings as txt2img but with these differences:

CFG Scale: 26 ~
Denoising strength: 0,5 - sometimes 0,8

90s VHS TV Show Style - LoCon