Then the work you want starts by finding the face, and this page never looks for one. Marks on skin, wrinkles, teeth, eyes and red pupils all need a tool that knows what it is standing on — [retouchpicture.com](https://retouchpicture.com/) has those, and it is built around the face rather than around a disc.

There is one speck on a cheek and nothing else wrong.

A single small mark on an even patch of a cheek is inside what a disc can do. The failure starts where skin stops being even: a nostril, a lash line, the corner of a mouth.

How does the page decide a photograph holds a face?

It counts how much of a coarse sample of the frame falls in the colour range faces usually occupy. That is a guess from colour, not a detector, and it is wrong in both directions often enough that the suggestion it produces is only ever a suggestion.

Reading

Portraits are a different job

This page never looks for a face. That is a design decision, and it is the reason a tap on a cheek behaves the way it does.

What happens if you tap a cheek

The disc is filled from the ring of picture around it, exactly as it would be on a sky. On an even stretch of cheek that is often fine, because an even stretch of cheek is a smooth field and a smooth field is what this method is best at.

It stops being fine the moment the disc touches a feature. A nostril, a lash line, the corner of a mouth, the line where a jaw meets a neck: each of those is a hard structure, and a disc filled by averaging turns hard structure into a smear. The seam shows it immediately, which is the one mercy of the arrangement.

Why a face-aware tool is a different kind of program

Work on a person starts by locating the person. A tool that knows where the eyes are can treat the area under them differently from the area beside them; it can leave pores while removing a mark; it can find both pupils and correct them together. All of that follows from the detection step, and none of it is available to a program that only knows about a disc.

This page has no detection step and will not gain one. Adding it would not make the disc smarter — it would make this a face tool with a very small brush, which is a worse version of something that already exists.

The guess this page does make

When a large share of a coarse sample of the frame falls into the colour range that faces usually occupy, a line appears above the stage saying that the work probably belongs elsewhere. That is a count of colours, not a detector, and it is happy to be fooled by a close-up of sand or a wooden floor.

It errs towards saying nothing. A suggestion that fires on every photograph of a beach is worse than one that misses half the portraits it should have caught, because the second kind is ignored and the first kind is resented.

Answers

This is a portrait.: Then the work you want starts by finding the face, and this page never looks for one. Marks on skin, wrinkles, teeth, eyes and red pupils all need a tool that knows what it is standing on — retouchpicture.com has those, and it is built around the face rather than around a disc.
There is one speck on a cheek and nothing else wrong.: A single small mark on an even patch of a cheek is inside what a disc can do. The failure starts where skin stops being even: a nostril, a lash line, the corner of a mouth.
How does the page decide a photograph holds a face?: It counts how much of a coarse sample of the frame falls in the colour range faces usually occupy. That is a guess from colour, not a detector, and it is wrong in both directions often enough that the suggestion it produces is only ever a suggestion.