MANZANO MOUNTAINS by Nina Baldwin 10″ x 10″ on canvas – private collection

• short, thick strokes of paint are used to quickly capture the essence of the subject rather than its details. the paint is often applied impasto.
• colors are applied side-by-side with as little mixing as possible, creating a vibrant surface. The optical mixing of colors occurs in the eye of the viewer.
• grays and dark tones are produced by mixing complimentary colors. In pure Impressionism the use of black paint is avoided.
• wet paint is placed into wet paint without waiting for successive applications to dry, producing softer edges and an intermingling of color.
• painting in the evening to get effets de soir – the shadowy effects of the light in the evening or twilight.
• Impressionist paintings do not exploit the transparency of thin paint films (glazes) which earlier artists built up carefully to produce effects. The surface of an Impressionist painting is typically opaque.
• The play of natural light is emphasized. Close attention is paid to the reflection of colors from object to object.
• In paintings made en plein air (outdoors), shadows are boldly painted with the blue of the sky as it is reflected onto surfaces, giving a sense of freshness and openness that was not captured in painting previously. (Blue shadows on snow inspired the technique.)

The above is borrowed from Wikipedia…it is concise…thanks Wikipedia!