It matters how many pixels your image is made of. How many pixels do you need to know it's a person? How many to know it's Nicole? (These answers change if you step back from the monitor or squint.)
As a graphic look this method is meaningful: it reminds us that in today's world all computer images are made of little squares. And it's graphically striking. Pixelated images can also carry a dehumanizing look.
Bottom Line: Computer images are made of pixels. This has practical and aesthetic ramifications.
A real-world pointer:
People are confused by image resolution. In print there IS such a thing as resolution. An image SIZED to be 8 x 10 inches can be made up of anywhere from a few pixels to zillions. For print, the norm is 300 pixels per inch. An 8x10 at 300 pixels per inch is 3400 by 3000.
But resolution on the web is different from print. An 8x10 print res image uploaded to a website will be absurdly large, and people do this every day, so web pages often load SLOWLY. Average monitors have about 100 pixels per inch, so to make an image look 8x10 you only need 800 x 1,000 pixels.
73mm, f13, Studio Flash