School's example
Start with the blue pencil and follow the school's examples and always start with the middle line for all my sketches and while you draw the line you should put your paper at an 45 degree angle and try to draw a line across the page and try to make it straight
Now we fill in the fine line thick on the outside and thin on the in side and third we render with some gray marker pencils only going over.
One the second render make the line thicker and and darker on the bottom right because the light hits the top left of shapes
Third layer making it thicker,darker and expanding in to more areas more areas
Last go over with another layer of markering and darken are bottom right areas. Next we make the area being hit by the light less using the highlighter as means of using a white pencil on the top left of our shapes
And Last the add shadow using the black pencil start strong from the line and lighten as you drag it inwards