The difference is the camera doesn't lie.
That isn't true. At all. As an artist, you should know that.
Just because your an art student doesn't mean you know what you are talking about.
DING DING DING! Exactly. I can't tell you how many students at my art school couldn't draw themselves out of a paper bag, or went around spouting "facts" that they clearly misunderstood.
Oh I've heard of him, the thing is you need to remember is his portraits tend to be effing large, hence why so much detail. What's been posted is a shrunk down version of his original artwork, as such the details gets squashed together and the painting strokes gets lost. The thing is if you compare his image to the real photographs it's not hard to detect which is the painting.
His earlier work, sure, but his work since the 90s has been hyper-realistic where brush strokes are NOT visible. But that is besides the point. Like someone else said, even looking up close at a photograph will give away it's pixels/dots. Point is that Chuck's work is photo-realistic and capable of tricking you at all. If some one unfamiliar with Chuck Close were to look at the images I posted earlier, they wouldn't be able to pick the "fake". In short, Chuck Close (and countless other photo-realist artists) are examples that flat out disprove your stance that no artist has ever, nor could ever create something that looks 100% real.
This whole debate boils down to your misunderstanding of the Uncanny Valley concept. That could be your professor's fault, or your own. It doesn't matter, because I'm going to spell it out clearly:
The Uncanny Valley refers to the phenomenon that states that the more something appears to be real, yet - and this is very important - still retains noticeably artificial traits, we as humans are able to notice it/react uncomfortably.
Your stance is that the more real something looks, the more we can tell it is NOT real, and that this continues infinity. This is wrong. What you're describing is best called a slope or cliff, not a valley. Its not called the "Uncanny
Valley" arbitrarily. It is called that because like a geographical valley, it has both a descending side and an
ascending side - like a U or V shape. This means that as the fake image/object has less artificial traits the easier it is for the eye to be tricked. The whole point of the uncanny valley is to understand where and how the ratio of realistic and artificial traits stops being creepy/fake and starts tricking the eye. Countless movies and images have examples of artists crossing this valley and creating realistic images that successfully trick the eye and mind.
Art is NOT about what we can not do (regardless of the validity); it is not about setting limits and saying "we can never do this". If you - as an art student - really believe that it is impossible to cross this threshold (and that no one ever has, no less), then you are studying the wrong field and you need to stop wasting your money and drop out...and I truly say that purely out of compassion.