Linear perspective and anamorphosis drawn step by step, with vanishing-point overlays on public-domain paintings that state the assumptions behind every line.
Draw one-point perspective in ten steps: a horizon, one vanishing point, a cube sized with a distance point, a tiled floor, and a test on a Renaissance panel.
Image credit
"The Ideal City (central part)" by an unnamed Florentine artist and Giuliano da Sangallo — https://commons.wikimedia.org/wiki/File:Fra_Carnevale_-_The_Ideal_City_-_Walters_37677.jpg — Public domain (Painted about 1480–1484; credited by the Walters Art Museum to an unnamed Florentine artist and Giuliano da Sangallo (d. 1516), and an artist at work in the 1480s cannot have lived past 1956; PD worldwide (US: published before 1930; EU: authors died more than 70 years ago); museum photograph of a two-dimensional work released as public domain by the Walters Art Museum (Commons Walters Art Museum licence, VRTS ticket 2012021710000834)); modified: cropped to the central 1200 × 630 px (x 295–1495, y 10–640 of the 1798 × 651 px file); not scaled; colours not altered
In this site's overlay of Vermeer's The Milkmaid, 11 window edges nearly meet just above her right hand, missing one point by up to about 2.3% of the width.
Image credit
"The Milkmaid" by Johannes Vermeer — https://commons.wikimedia.org/wiki/File:Johannes_Vermeer_-_Het_melkmeisje_-_rijksmuseum_-_001.jpg — Public domain (Johannes Vermeer d. 1675 (Library of Congress name authority, 1632–1675); PD worldwide (US: published before 1930; EU: author died more than 70 years ago); museum photograph of a two-dimensional work marked public domain by the Rijksmuseum (Public Domain Mark 1.0, SK-A-2344)); modified: cropped to the painted surface (x 245–4600, y 215–5150 of the 4814 × 5537 px file), leaving out the canvas margins, frame edge, black background and colour chart; not scaled; colours not altered
The smear in Holbein's The Ambassadors is a skull stretched along one slanting line. Unstretch it, find where to stand, and draw a stretched face of your own.
Image credit
"The Ambassadors (Jean de Dinteville and Georges de Selve)" by Hans Holbein the Younger — https://commons.wikimedia.org/wiki/File:Hans_Holbein_the_Younger_-_The_Ambassadors_-_Google_Art_Project.jpg — Public domain (Hans Holbein the Younger d. 1543 (Library of Congress name authority: 1497?–1543); painted 1533; PD worldwide (US: published before 1930; EU and UK: author died more than 70 years ago); the photograph is a faithful reproduction of a flat work, marked PD-Art on Wikimedia Commons); modified: reduced from 30000 × 29560 to 6000 × 5912 pixels by averaging 5 × 5 blocks; not cropped; colours not altered
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