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A relaxed mouth gives you a clear starting point
A wide smile changes the visible outline of the lips and exposes more teeth. That does not make a smiling photograph unusable, but it adds details that an editor must preserve. For your first comparison, choose a relaxed expression that you can reproduce.
Do not force the lips tightly together or purse them to imitate fullness. Start with a source that represents the expression you want to compare. If you later test a smiling photo, treat it as a separate source rather than another stage of the same before-and-after.
Makeup can obscure the boundary you are judging
Overlining creates a visible outline beyond the original lip edge. Heavy gloss can add bright highlights that look like added volume. If your question is specifically about shape, a minimally styled photograph may be easier to evaluate.
You can still explore a concept with lipstick, but ask the model to preserve its color and finish. A result with a new shade or softer skin may look more polished while failing to show the change you asked for. Avoid comparing a bare-lip original with a heavily restyled output.
Keep teeth and the mouth opening out of the edit
When teeth are visible, include an explicit preservation request: “Keep the teeth, mouth opening and expression unchanged; only explore modest lip fullness.” After generation, inspect for extra teeth, blurred edges or a different opening.
If these details change substantially, do not accept the picture merely because the lips look fuller. Try a better source or clarify the failed instruction before another paid generation. Editing a distant or blurry mouth repeatedly is unlikely to produce a reliable comparison.
A quick source-selection routine
Choose an original, unfiltered portrait. Check focus around the mouth, enough light to see both lip edges and a crop that still includes the whole face. Reject images where a hand, hair or an object covers the lips. Keep the source file rather than a compressed screenshot.
Then use one focused brief and inspect the result at the same scale as the original. For a fuller workflow, read lip preview photo preparation. For deciding between degrees of change, see subtle versus fuller concepts. These are image exercises, not predictions of a procedure.
Should I retake this lip photo?
| What you see | What becomes hard to compare | Practical next step |
|---|---|---|
| A broad smile with teeth | Resting lip outline versus smile-related shape | Take a second portrait with a relaxed mouth. |
| Liner beyond the lip edge | Makeup boundary versus the visible natural outline | Use a photo without overlining if the outline is your target. |
| A strong glossy highlight | Apparent fullness versus reflected light | Use softer, even lighting. |
| A hand or hair over a mouth corner | Mouth width and preservation of the corner | Retake with both corners visible. |
You do not need a polished studio portrait. You need a source where the detail you want to compare is visible and the expression is easy to preserve.
Compare a changed outline, not a changed smile
Look at the mouth corners before judging fullness. If they move or the teeth become more visible, the expression may have changed. Then inspect the upper edge, lower edge and center of each lip separately. A different lipstick shade can make an edit look stronger while obscuring whether the requested outline changed.
The lip before-and-after walkthrough demonstrates how to read a real output. Use the lip filler photo simulator with a focused request once the source is suitable.
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By PlastyAI editorial · Published . Written with AI assistance and checked against our photo-preview workflow. Product guidance, not clinical advice; not clinically reviewed. Send a correction.