A whole picture that is a balanced and pleasing arrangement of spaces and shapes.

The composition in an artwork.

Just basically how the painting is put together.

Different degrees of lightness and darkness.

Contrasting very dark and very light.

i think it is about the contrast of color in painting
that if one color in your painting is more in the eyes than the others it means that color has the more tone than the other color .

The solid 3 dimensional shape.

Is one of the seven elements of art.

a form is a three-dimensional geometrical figure.

The outline or form of something.

A line that stand's out from the drawing.

a bold outline.

A single long mark made by any tool you can draw with.

Line in drawing refers to a type of mark that contains both a direction and length.

Line is described as a particular path of a point that moves in space.