Check the link I gave you and try different responsive sizes in your browser. You will see different variations in quality of the image when you see the page in maximum window and small window medium windows sizes.
FYI my screen is 1920 x 1080 so when I resized my browser to change responsiveness I could see different image sizes… I mean half zoomed or 75% zoomed when I got absolute low browser size I can see actual picture size with perfect clarity