Visual depth or foreground openness; park-like or savannah-like scenes; verdant foliage; deflected vistas (implying new information just beyond the visual bounds).

Calm water scenes such as rivers, streams and lakes. Avoid dangerous-looking rapids or stormy oceans.  Inclusion of a "refuge" or an imagined place to stand is recommended when possible.

Healthy, fresh-looking flowers & vegetation; vibrant colors; familiar plants.

Bright colors and depictions of warm seasons, verdant foliage, and welcoming scenes.  

Smiling or positive facial expressions; friendly or nurturing relationships; generational and cultural diversity; people at leisure with prominent nature.

Any wildlife imagery should be of animals widely considered non-threatening.  Avoid close ups of large mammals looking directly at the viewer.