Picture #1 (You should replace this)

The original image has a resolution of 500 x 500

The aspect ratio is 500 / 500 or 1

The image at half the size is 250 x 250

The image at quarter the size is 125 x 125

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Picture #2

The original image has a resolution of 1600 x 900

The aspect ratio is 1600 / 900 or 16/9

The image at half the size is 800 x 450

The image at quarter the size is 400 x 225

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Picture #3

The original image has a resolution of 1200 x 900

The aspect ratio is 12/9 or 4/3

The image at half the size is 600 x 450

The image at quarter the size is 300 x 225