I don’t know a lot about ai but I have a lot of experience with art, and I have a guess as to part of the problem. You could say humans also struggle with eyes. When drawing faces, eyes can be the hardest part for a lot of people. It’s not that an eye is difficult to draw on its own, it’s because even the slightest bit of wonkiness will be extremely distracting and take over the whole picture.
The thing is that we are not as objective as we think about how accurate an image is, we don’t process or evaluate all types of visual information equally. Because of the way our brains are wired, much more processing power goes towards noticing extremely subtle things about a human face. I could do a quick scribble of a tree in your back yard and you’d be like “yeah that’s what that tree looks like.” Someone highly skilled could labor over a portrait of your family member for weeks, and you’d instantly still see every little thing that’s not quite right. Eyes particularly show a lot of very nuanced things about a person and their emotions. We’re an incredibly social type of animal whose complex interactions rely on our ability to memorize hundreds of different faces. We simply don’t devote that amount of brain-space to things like telling dogs apart, being able to identify every different tree in a park, etc. But just millimeters difference between faces and we’re like “those people look nothing alike.” If eyes aren’t perfectly aligned we’ll see the person as cross-eyed, drunk or somehow compromised. If the lid drops a little we’ll see them as angry, if they’re too open they’re high.
We’re all expert eye and face readers, the computer may just not be up to our standards.
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