Whether you are planning an accurate drawing, or you are attempting to paint a colour portrait, you will need to trace on the definitive support (paper, canvas, card, etc.) the outline which will serve as a base for the work. To this effect, you can, at least to start with, take advantage of a number of devices to effortlessly enlarge a sketch or even a photograph to the desired dimensions. You can use an ordinary slide projector to magnify the image on to the support and trace the face or figure's main contours.
Alternatively, you can use an episcope: an optical tool which allows you to enlarge and project images from opaque supports (photographic prints, sketches or reduced photocopies of drawings and paintings, etc.). These are practical devices, almost 'tricks' which may even harm one's artistic growth if one becomes dependent on them. More appropriate, therefore, is the 'grid of squares' method, which is well known even at school level. Draw a grid of squares on the image to be enlarged (whether a drawing or photograph) and then transfer that same grid, with the same number of squares, enlarged, on to the larger surface.You can then easily transfer strokes within individual squares keeping them in proportion.
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