How can we say nobody's perfect if there is no perfect to compare to? Perfection implies that there really is a right and wrong way to be. And what type of perfection is the best type? Moral perfection? Aesthetic? Physiological? Mental?
If a thing happens once, it can happen again. If any human being has ever realised perfection, we too can do so. If we cannot become perfect here and now, we never can in any state or heaven or condition we may imagine.
I don't know that I could draw one that's perfect. But I'd rather by approximately right than precisely wrong, and it would be precisely wrong to turn it down.
The pursuit of perfection is frustrating and a waste of time, because nothing is ever perfect.
The pursuit of excellence is commendable and worthwhile. Therefore strive for excellence not perfection.