In various occasional uses. By means of lines; graphically. Obsolete.

in crayon also in crayons: usually said of a design drawn with a crayon or crayons; also an artist in crayons, etc. (Cf. in colours, in oils.)

in outline: with only the outline represented, drawn, or visible.

by free-hand: = sense C.

A thick paste made from finely ground pigments mixed with a solution of gum arabic in water; a crayon made of this, used for sketching or colouring…

With a free hand; without guiding instruments or other artificial aids; by eye.