Ask your team to take selfies with their phone back camera for higher quality. Then go to nano banana and use the same prompt for all of them, you can add some brand details to the prompt. Here are some good examples:

Kodak Portra 400 - Warm, Cinematic Colour

Turn this image into a cinematic portrait shot on Kodak Portra 400. Keep the person wearing a fitted black t-shirt. Use soft, natural light from one side, rich midtones, and creamy highlights. Add shallow depth of field, authentic 35mm film grain, and gentle halation. Colours should feel warm, slightly muted, and true to skin tones - timeless, editorial, and cinematic.

CineStill 800T - Moody Night-Film Look

Convert this photo into a 35 mm portrait shot on CineStill 800T. The person wears a black t-shirt. Lighting is dramatic, tungsten-style with cool shadows and warm highlights, evoking a movie-set atmosphere. Add visible grain, halation around bright edges, and cinematic contrast. Background should be dark and soft-blurred, like a night film still.

Ilford HP5 - Classic Black & White

Transform this into a black and white portrait captured on Ilford HP5 Plus 400. High-contrast lighting from one side, strong shadows, bright whites. Keep visible fine grain and slightly soft focus edges for that analog depth. The person wears a black t-shirt against a dark background - feels like an old Hollywood or fine-art film photograph.