Interesting to consider the illusory nature of paint especially when one then thinks of the works of Auerbach and Bomberg, where the paint becomes the painting -abstracting and easing away from the image. The illusion then just 'suggests' and makes the viewer work hard to 'see'.
The problem of perspective here decreases as the structure of the painting is echoed in the paint. So expressiveness and originality soars to the fore, leaving behind the core basic traditions of paintwork. As in literature, creativity though only occurs when one can transcend the basics.
Such a long way to go. Does challenge the mind set.