Please see the drawing tutorial in the video below
3D Hole Drawing step by step
First, we need to prepare a pen or pencil and A4 paper.
Step 1. Sketch the Hole’s Mouth
First, we draw the mouth of the deep hole by drawing an oval in the middle of the A4 paper. It’s very simple, isn’t it?
Step 2. Draw the Depth
Next, draw a curve just below the top edge of the oval to create the first depth of the hole.
Step 3. Add the Depth Steps
Continue drawing the depth steps until they almost touch the edge of the first oval below. Note that the flat steps will have shorter intervals, and there will be a flat step after every vertical slope, as illustrated in the image.
Step 4. Color the First Depth Step
Use black to color the first depth of the hole.
Step 5. Color the Remaining Steps
Similarly, color each step black to represent the vertical depth, which will appear dark due to the lack of light.
Step 6. Color the remaining steps
Finally, we color the remaining squares gray because these are flat steps and will receive more light. That’s how we easily drew a 3D Hole on an A4 sheet of paper!