I drew a room using two vanishing points. 

If you look at the room as shown in the image above, the front and left sides will each have their own vanishing points, making them visible. Conversely, if you look at it as shown in the image below, the front side will be visible with one vanishing point, and the left and right walls will  have their common vanishing points. If you understand the situation in the image above, you'll also understand the situation in the image below, so in this post, I'll explain using the situation in the image above. 

Draw a vertical line between the front wall and the left wall. Roughly draw the line to match the feel of the painting you're drawing. Then, determine the line where the eyes will be. Depending on the height of this line, you can create a variety of impressions.

Draw a straight line from one end of the vertical line toward the eye-level line. The intersection of this straight line and the eye-level line is the first vanishing point. 

This time, draw a straight line from vanishing point 1 toward the other end of the vertical line drawn earlier. Using that line as a reference, draw the boundary between the right wall and the floor. 

Let's find another vanishing point. Extend the boundary between the left side and the ceiling and find the point where it intersects the eye-level line.

This is vanishing point number 2. 

Draw a straight line passing through the second vanishing point and the vertex below that vertical line, and draw the boundary between the left wall and the floor based on that straight line. 

The room structure is now complete. Now, let's draw the main elements of the room. Draw all elements based on vanishing points 1 and 2. 

I simply colored this sketch. 

We're not drawing architectural drawings. We don't need to draw them to exact dimensions. 

Drawing a room using two vanishing points