Are you seeing the sunset as it was meant to be seen?
I was looking at some of the posts on a friends relatively new laptop computer. Most photos looked nothing like they should. I was surprised how the most essential settings, brightness and contrast were inaccurate at their defaults.
Below, you should see able to distinguish all 16 gray levels. If you can not, try to adjust your brightness and contrast settings until you can.
Calibrating color is a lot more complicated because our eyes automatically
correct for whites in the picture. To check for colors we need to compare a printed calibration chart against the represented colors on the monitor (or use special hardware). Color calibration is less critical for general viewing of images on a monitor, but becomes essential when prints have to match what we see on screen.
For more information,
google "Monitor Calibration".