either? Will he know from use whether or no his drawing is correct or beautiful? or will he have right opinion from being compelled to associate with another who knows and gives him instructions about what he should draw?

Neither.

Then he will no more have true opinion than he will have knowledge about the goodness or badness of his imitations?

I suppose not.

The imitative artist will be in a brilliant state of intelligence about his own creations?

Nay, very much the reverse.

And still he will go on imitating without knowing what makes a thing good or bad, and may be expected therefore to imitate only that which appears to be good to the ignorant multitude?