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Define what you want to keep
Start by noting the parts of the original you like: the lip outline, the balance between upper and lower lips, the mouth corners or the expression. These become preservation instructions. You do not need to ask for a change simply because the tool can make one.
Choose a close, clear portrait with a relaxed mouth. Use the same source for both concepts. Comparing a smiling photo with a neutral one makes it hard to separate expression from the requested edit.
Write two briefs that differ in one way
For the first: “Add a small but visible amount of fullness to both lips. Preserve the original lip proportions, color, mouth corners, teeth and expression.” For the second: “Explore a more noticeable increase in fullness than the first concept, while preserving those same features.”
Keep the direction consistent. Do not also change color or sharpen the lip border in only one version. These are relative visual instructions, not calibrated settings. The words cannot specify an injection quantity, and the tool may not produce evenly spaced degrees of change.
Return to the original between versions
Create each comparison from the original portrait where the workflow allows. Repeatedly editing an edited face can gradually change details you never requested. Save the text of each brief so you can tell which difference you intended.
Review the displayed credit cost before another generation. If the first output is unchanged or changes your smile, identify that failure before moving on. Two attractive images are not automatically a useful controlled comparison.
Choose by the feature, not by the polish
View both concepts beside the original at the same size. Check upper and lower lips separately, then teeth, nose and chin. Ask which version communicates your preference; do not assume the larger change is the better result.
If neither feels right, keep the original as a valid preference. A concept cannot predict how filler would look or determine whether it is suitable for you. For product differences, read lip filters versus AI previews; for treatment questions, visit the lip filler guide.
Do not label appearance concepts as injection amounts
A subtle edit is not a validated simulation of 0.5 mL, and a fuller edit is not a validated simulation of 1 mL. See what filler-volume labels can and cannot tell you before comparing photographs with dose captions.
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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.