Here's my effort, from a picture I took in my own backyard:
The original (reduced in resolution to 468x400)
AGA 256 colour
And yes, I know, I should have reduced the resolution further, but I wanted to not have them all postage stamp sized on a modern display device, without doubling their size. The intention is to show the colour depth differences, hence choosing an original image with the many shades of blue in the sky.
Any feedback would be very much appreciated.