Lighthouse again...

Quick blip tonight - it's been a busy day!

I have a query though, that I'm hoping someone can give me an answer to.
When I am trying to work out which shots to blip, the quality of the image seems to depend on the angle of my laptop screen - at some angles the photos look quite ok but a slight movement can make them looked washed out. How do I judge what it will look like when posted on blip and on other people's screens??