In Visual Presentation Technique course, I had learnt how to render 3D object by using marker :D

Basic Shape, Shawdow and Rendering

Plastic Effect

Chrome & Steel Effect

Wooden & Light Effect

2015  VS  2019

The first picture is my guitar drawing by using water colour in year 2015.

The last picture is using marker to draw the guitar to see the differences.

Look like very significant improvement in my drawing skill after learning this course~ㅋㅋㅋㅋㅋ