One tip, don't go pixel peeping. Folks are far too keen to zoom into an image on screen just because they can. It's at that level you see the flaws. BUT If you don't see them at the size they are to be printed who cares?
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Bill Allsopp
Don't just look, see!
http://www.britishlandscapephotographs.co.uk
http://www.billallsopp.co.uk