Use a ruler to connect the corners of that square to the dot.
Always start with a light touch. These construction lines (orthogonals) are usually erased once the final shape of the object is defined. Basic Perspective Drawing: A Visual Approach
In , lines lead to two separate points on the far left and right. 3. Orthogonal Lines (The "Receding" Lines) Use a ruler to connect the corners of that square to the dot
This is the most important line in your drawing. It represents your eye level. Basic Perspective Drawing: A Visual Approach