I think those problems are common to all cameras/photographers at some time or other. The shots I've taken that look great in the viewfinder but thoroughly indifferent when I see the results are nobody's business!
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The key to solving this problem is to develop what Edward Weston termed the ability to "see photographically." By being in complete control of his entire approach (nowadays, I guess, called a "workflow) he KNEW intuitively what the image would look like on paper.