Some thoughts and things; on keeping a small notebooks in an ‘always carry a sketchbook’ - kind of way. Drawing for fun, not so much to study.

Spilt some tea :(
keep your desk clean!

feel like doing them over
but then what's the point of doing this exercise? Making perfect cubes or making mistakes to get a feel for perspective ~ just move on and do better next time

Ebay for Reference images

Find those 'moody' early photographic prints by searching with keywords like 'Albumen print', Silver-based prints', 'Photogravure' + Mountain

bl.uk photographicprocesses

"The minor axis cuts an ellipse into two symmetrical halves through the narrower side."

Freehand lines within a grid.

Sometimes it's faster to guess, start with a loose sketch and then clean up your lines. If you start with a grid or a cube you've established perspective, you know where the camera is.

Books on learning perspective:

Perspective Made Easy by Ernest Ralph Norling. Scott robertson's how to draw (of course). Another favorite is The Theory and Practice of Perspective, by George Adolphus Storey. It's difficult to follow, but you'll find this book goes way more in depth than the more modern sources do. Artists in 1910 did not have 3d animation software to solve their problems, this book is full diagrams showing how to plot perspective by hand.

Software tricks that help you figure out the perspective your image is in.

• https://www.youtube.com/watch?v=A9PIUG2fjcQ
• Carapace / Using Epic Perspective Grid Generator
• https://www.youtube.com/watch?v=2xMkpCPlDhk
• https://www.youtube.com/watch?v=2TmoMaotraA
• Google gives you nice alternatives to carapace
• https://dribbble.com/shots/1188403-perspective-tools-for-photoshop
• https://www.youtube.com/watch?v=4Mtrrbz-1Co
• Sketchup does something similar with Match Photo
• https://www.youtube.com/watch?v=2hSyw6bobpc

In ditzelfde boek wordt ook een methode omschreven waarbij soldaten in het verleden perspectieftekenen gebruikten voor het berekenen van de afstand die een kanonskogel zal vliegen.
Alsof ze via een of ander optisch fenomeen terugrekenen hoe hoog of laag de loop van het kanon moet staan. Precies hoe ze dit gedaan hebben weet ik niet, misschien kan iemand mij dit eens uitleggen.

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Draw plants ~ A tiny mistake here or there? That's not so bad. Portraits are more difficult, we all know what a face should look like and because of this, it's easy to see where you got the proportions wrong. With these complex abstract things it's not so noticeable where your drawing is off.

Things are 3d but paper is flat.

Try to get your drawing to read as if it's an actual thing in 3d space. Remember to find the big shapes first and then use contour lines to show how they sit in 3d space.