Besides advertising new products and services, commercial photography also
a. documents fashion trends at different times in history.
b. allows for many artists to work who might otherwise be unemployed.
c. encourages the use of new and innovative techniques in photography.
d. accomplishes all of the above.

lines and shapes are a part of the visual elements which can be played with and used to create a mood or feeling in a composition.

some of the other elements include the pattern, color, tone and texture. all these elements serve together as the construction blocks which are used by the artists to create artwork.

lines are used to form drawings and different shapes are formed when these lines are used in certain lengths or angles. so the artist can play with these elements of art to create and express different moods, thus conveying different  meanings.