Those eyes scare me <| sep |> Why ? Nobody reuses seeds . That ' s not how farming works . The vast majority of nonGMO seeds are hybrids which also only last for one season and are licensed the same way . <| sep |> We don ' t get to tell other countries what to do . <| sep |> I haven ' t gone through any of those books , so I can ' t comment on them specifically . I will however also recommend How to Draw and the sequel How to Render by Scott Robertson . If you want to learn how to construct and render complex geometrical objects like vehicles or architecture then they are great books to get . The books however don ' t talk much about very formal measured perspective . So for more in depth info on things like station points and measuring lines you might want to look elsewhere . The book focusses mostly on freehand sketching with optionally a perspective grid . Specifically for learning to draw figures in perspective you could also look into Andrew Loomis ' Figure Drawing for all its Worth .