His picture, if he painted one, would make those other things prominent.
So it is with everything that we see.

None of us sees more than certain features in what the eye rests upon, and if we are artists it is only those features that we should paint.

We can't possibly paint every detail of everything that comes into the picture.

We must make a choice, and of course we choose the features and details that please us best.
Now, the purpose of painting anything at all is to paint the beauty of the thing.

If you see something that strikes you as ugly, you don't instinctively want to paint it; but when you see an effect of beauty, you feel that it would be very nice indeed to have a picture showing that beauty.