Screen-lit night selfie

Use this guidance to compose an image prompt for a front-camera selfie lit mainly by a phone's continuously glowing screen in a dark environment. First decide where the light comes from, how far the phone is from the face, and how much background remains visible. Select relevant fragments rather than sending this whole guide to the image model.

Describe the relationship between screen light and ambient light

The screen sits near the camera, usually creating near-axis, relatively frontal illumination. Its height and tilt affect shadows around the eyes, nose and chin. Shadow softness depends on the screen's apparent size relative to the face; do not assume completely shadowless light or strong side lighting. A weak nearby screen can illuminate a face without plausibly lighting an entire distant room.

Weak, close-range light from the phone screen near the lens keeps the face readable while the sides of the hair and the distant surroundings fall into shadow.

A few indistinct room contours remain visible, with the background substantially darker than the face and some subtle shadow detail.

Choose the setting from the user's request: a dark room, a car or outdoors at night can work. If streetlights or a lamp are present, establish whether they contribute weak ambient light or another dominant source. Screen content, display settings and camera white balance affect colour. Do not default to saturated blue skin; neutral screen light with natural skin colour is a useful option.

Continuous screen glow differs from a brief screen flash. Apple's Retina Flash documentation describes a temporary brightness increase and colour adjustment, not ordinary continuous display illumination. It does not establish a universal light level for screen-lit selfies.
https://developer.apple.com/library/archive/documentation/DeviceInformation/Reference/iOSDeviceCompatibility/Cameras/Cameras.html

Establish an actual selfie viewpoint

Start with an arm's-length camera distance, camera height and face placement. Front-camera fields of view and crops vary by device. Distance changes facial perspective; inserting "85mm" does not remove the perspective of an arm's-length viewpoint. Fujifilm explains the distinction between camera distance and focal length.
https://www.fujifilm-x.com/en-gb/learning-centre/understanding-lens-compression/

Handheld front-camera view at a natural arm's length, lens close to eye level, face near the centre, with subtle close-range perspective.

The photographing arm naturally enters the edge of a slightly imperfect crop, as in a personal handheld selfie.

A slightly raised phone is optional. An excessively high, close viewpoint can enlarge the head relative to the body. In an ordinary single-phone front-camera selfie, the photographing phone is normally outside the image. A full view of someone holding it may instead describe an observer's photograph or a mirror selfie.

Choose a plausible degree of low-light texture

Realism comes first from coherent lighting, viewpoint and detail treatment. Smartphone multi-frame processing can reduce noise and brighten dark regions, so coarse grain is not compulsory. Google's low-light imaging explanation supports this principle, without specifying the look of every phone.
https://research.google/blog/night-sight-seeing-in-the-dark-on-pixel-phones/

Fine skin-tone variation and natural skin sheen, a little low-light noise in darker areas, and mild detail softening from phone denoising.

Eyes and main facial features remain clear while deep hair shadows and the background lose some detail, with clarity varying naturally across the image.

Noise, compression and motion softness are optional effects, not a checklist to apply together. Preserve requested beauty and refined makeup; do not manufacture large pores, blemishes, greasy highlights or fatigue. Light clothing may become a prominent bright region. If garment construction matters, make those details readable without uniformly lifting the whole room.

Correct the observed problem

• Looks studio-lit: remove unexplained even fill, perfect rim lights and completely shadowless facial lighting; restore a nearby screen against a dark environment.
• Face looks dirty or unreadable: specify readable facial exposure and natural skin colour, letting the background carry most of the darkness.
• Looks like daylight simply darkened: clarify the source position, lighting range and face-to-background brightness difference.
• Does not read as a selfie, or features stretch: adjust camera distance, height and face position before adding camera brand names.
• Face or makeup becomes coarse: reduce defect, noise and oversharpening requirements while retaining subtle natural variation.

The photographic principles support this advice; the fragments still need testing with the selected image model. Vary expression, screen brightness and background visibility to match the user rather than fixing a single room, pose or identity.