Answer: Sharpness comes down to how defined the details in an image are—especially the small details. For example, if a subject’s eyelashes are an indistinct black blur they won’t appear sharp. If, on the other hand, you can pick out each one then most people will consider the image sharp.
Light, Le Corbusier was a Swiss-French architect and urban planner who was a huge influencer in the evolution of what is now called the modern style of architecture.