You have probably had this happen: the render comes out sharp, the skin texture is convincing, the lighting is fine, and yet the portrait still reads as fake. Nine times out of ten the problem is not the model or your wording. It is framing. Composition mistakes are the fastest way to make a believable face feel like a mannequin, and they are also the easiest thing to fix once you know what to look for.
If you render through a text prompt based image tool, you get almost no framing control from the interface itself, so the composition has to come from your description. That is good news, because it means the fix is a handful of specific phrases you can reuse.
Headroom is the tell
Headroom is the distance between the top of the head and the top edge of the frame. Human photographers leave a predictable amount of it — usually a sliver, maybe five percent of the frame height. Generators do not know this convention unless you say so, and their default is all over the place. Sometimes the hair is sliced off mid-forehead, which looks like a mistake. Sometimes there is a canyon of empty wall above the head, which makes the subject look like a tiny figure lost at the bottom of the picture.
When you describe a portrait, say the framing out loud. "Head and shoulders, small amount of space above the hair, framing from mid-chest up" does more for realism than any adjective about skin detail. If the crop keeps drifting, name a lens instead: a tight 85mm portrait crop and a loose 35mm environmental crop create very different headroom habits, and the model has seen enough of both to follow the hint.
Eyeline sits high, not centered
Amateur snapshots put eyes dead center in the frame. Portraits that look intentional put the eyeline in the upper third — roughly a third of the way down from the top edge. This one adjustment changes the emotional read of a face. Eyes low in the frame make the subject look small and passive; eyes high make them look present and alert.
There is a second trick here. If your subject is looking off-camera rather than into the lens, leave the empty space on the side they are looking toward. This is called looking room, and when the model ignores it you get a face pressed against one edge staring into a wall of nothing. Say "looking left, open space to the left of the frame" and the composition tends to cooperate.
Give hands and shoulders somewhere to go
Faces are the easy part. What breaks a portrait is the body attached to it. Crops that cut through the wrist, the elbow, or the ankle look accidental. Crops that cut at mid-forearm or mid-thigh look deliberate. The rule of thumb from photography holds here: never crop at a joint.
Shoulders are worth describing too. Square shoulders straight at the camera read as passport photo. A slight turn — "shoulders angled maybe twenty degrees from the lens, face toward camera" — instantly adds depth and stops the silhouette from being a flat rectangle.
Depth cues that cost nothing to add
Flat portraits feel synthetic because the background sits on the same plane as the face. Two cheap phrases fix this: a shallow depth of field ("background softly out of focus behind the subject") and a light source that separates the subject from what is behind them ("rim light catching the edge of the hair on the left"). You do not need to describe an entire scene. You need one clear plane of separation.
Watch out for busy backgrounds unless you actually want them. A face competing with a patterned wallpaper is a face nobody looks at.
A reusable framing line
Here is a pattern you can paste and adapt: "Head and shoulders portrait, eyeline in the upper third, small headroom above the hair, shoulders turned slightly from the lens, subject looking left with space on the left, background softly blurred, rim light on the hair." Swap the pose and the light, keep the structure. The structure is what sells it.
Composition is the part of rendering that people skip because the model seems to handle it. It does not handle it, and that gap is exactly why so many outputs feel off without anyone being able to say why. If you want to go further, read through the image generation guides on the site — the prompt-writing habits there stack nicely with these framing rules, and together they cut out most of the reasons a portrait lands in the reject pile.