In real life, Ren was 32, the painting shows over 60. The Artist have to use a familiar but old looking image, a standard portrait ,( for a period of time). Ren wears shorts in the Long March in summer. The artist changed that, too. The color is amazing, not copying reality but better than reality.
The artistic truth doesn't equal to reality. Art should be stronger, more concentrated, more typical.
When one said "no hurry", he might consider that action at that moment and place only. But the artist, making use of a scene at this time and place, intend to show his lifetime character.
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