Look at the composition of these two works of art. Composition is how the elements of a work of art are arranged. Both have horizontal lines that make the piece seem calm. They don't have diagonal lines which add movement to a work of art. Movement is a principle of design that shows action by arranging the parts of the composition to give motion to the piece.
Color is another element that can create mood.
Bright colors usually add excitement and movement to art, but dull colors are calming and subdued. Look at how the ceiling light is shining on the sculpture on the left. Light and Shadow are elements of art that can be used to create depth and interest in artworks. More information on Thomas Craig Dunstan.