Draw a rectangle or wall shape as the base
Add evenly spaced horizontal lines across the shape
Add staggered vertical lines between the horizontal rows
Offset each row so the joints do not line up
Keep the brick sizes consistent
Round or slightly irregularize some edges for realism
Darken the mortar lines between bricks
Add light shading on one side of each brick
Add darker shading on the opposite side
Vary a few brick tones for a natural look
Erase any construction lines
Outline the final brick pattern cleanly