Next to the subject, the most important part of every picture is the light. It affects the appearance of everything you photograph. On a great-grandmother, bright sunlight from the side can enhance wrinkles. But the soft light of a cloudy day can subdue those same wrinkles.
Don’t like the light on your subject? Then move yourself or your subject. For landscapes, try to take pictures early or late in the day when the light is orangish and rakes across the land.
Both example below are good.