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To draw 3D stairs going downwards, you'll generally use the principles of perspective drawing. Here's a breakdown of the common approach, often using one-point or two-point perspective:

General Concepts for Downward Stairs in 3D:

Perspective: The key to making stairs look 3D is using perspective. Lines that are parallel in reality will converge towards a vanishing point on your horizon line in the drawing.

Vanishing Point(s):

One-Point Perspective: Often used when you are looking straight at the stairs. All lines that recede into the distance will converge at a single vanishing point.

Two-Point Perspective: Used when you are viewing the stairs from an angle. There will be two vanishing points on your horizon line, and lines will recede towards either of these points.

Horizon Line: This is an imaginary line that represents your eye level. The vanishing point(s) will be located on this line.

Overlapping: Drawing the steps overlapping each other creates the illusion of depth. The steps closer to the viewer will appear larger and will partially cover the steps further away.

Shading: Applying light and shadow will enhance the 3D effect, making some parts of the stairs appear to recede and others to come forward.

Steps for Drawing Downward Stairs (General Approach):

Establish Your Perspective:

Decide whether you want to use one-point or two-point perspective.

Draw your horizon line.

Mark your vanishing point(s) on the horizon line.

Draw the Front Face of the Stairs:

Draw the visible front edge of the first step as a rectangle or a series of connected rectangles (depending on the number of steps you want to show directly facing you).

Determine the Depth and Direction:

From the corners of your front step, draw lines that extend towards your vanishing point(s). These lines will define the receding edges of your stairs. For downward stairs, visualize these lines going "into" the page and slightly downwards.

Mark the Depth of Each Step:

Along the receding lines, mark off equal (or gradually decreasing for a more realistic effect) distances to represent the depth of each step.

Connect the Depth Marks:

Connect the marks you made in the previous step with lines that are parallel to the front edge of your first step (in one-point perspective) or that converge towards the opposite vanishing point (in two-point perspective). These lines will form the back edges of each step.

Create the Risers (Vertical Parts):

Connect the back edge of one step to the front edge of the step below it with vertical lines.

Refine and Add Details:

Erase any unnecessary construction lines.

Add details like railings, textures, or any surrounding environment.

Consider the thickness of the steps and add that detail.

Apply Shading:

Determine your light source.

Shade the undersides of the steps and any areas that would be in shadow to enhance the 3D form. The parts of the steps facing the light source should be lighter.

Tips for Downward Stairs:

Visualize: Imagine looking down a real set of stairs. How do the steps get smaller as they go down and away from you?

Start Simple: Begin with a basic block shape to establish the overall form before adding individual steps.

Consistency: Ensure your receding lines all converge correctly to maintain the illusion of consistent perspective.

Practice: Drawing perspective takes practice. Don't be afraid to try multiple times and refer to examples.

You can find visual tutorials on the resources I previously shared, searching for terms like:

"How to draw 3D stairs one-point perspective"

"How to draw 3D stairs two-point perspective"

"Drawing stairs going down in perspective"

These videos and guides will provide you with step-by-step visual instructions that can be very helpful in understanding the process. Good luck with your drawing!