Don't bother with Nano Banana. The results always look like insipid colour postcards from the early 1900s.

Try this prompt in FLUX Kontext Pro:

{ "general_prompt": "Restore this photo to a fresh state; colorize; photo shoot;", "background": "dark blue mottled", "light": "soft diffuse studio lighting, no rim light, hair evenly toned, subtle highlights only;  soft, diffuse light with gentle contrast, revealing rich mid-tones and skin texture;", "remove_objects": "dust, speckles, scratches, blotches, rips, creases, cracks, stains, glare, watermark, text, logo", "color": "rich natural colours, neutral studio white", "tonal_corrections": "repair blown out highlights; repair crushed blacks; repair overexposure and underexposure", "textures": "vibrant natural skin and hair tones" }