A more accurate impression is basically always one that notices more mistakes. Besides, after some time passes every flaw in my performance becomes painfully obvious to me, most likely because the piece is no longer in my recent memory and therefore probably no longer subject to this unconscious attempt to gloss over mistakes.
And of course, after a while, you just develop an intuition for this kind of thing.
A more accurate impression is basically always one that notices more mistakes. Besides, after some time passes every flaw in my performance becomes painfully obvious to me, most likely because the piece is no longer in my recent memory and therefore probably no longer subject to this unconscious attempt to gloss over mistakes.
And of course, after a while, you just develop an intuition for this kind of thing.