As I've been looking through the many photo contest submissions (especially in landscape), I'm blown away with how much "unsharp-mask"ing is going on. Holy smokes! I think it's probably the most over-used, misapplied function of photoshop, lightroom, etc. It has it's place of course. Subtle sharpening, subtle contrast enhancement. Or over-the-top extreme HDR (not my cup of tea, but still can look interesting). But it's all about moderation and subject. You can get away with bumping it up on clouds frequently. You can do some subtle work on faces or detailed objects. Or even a super detailed subject like a rusted out truck from the 40s, you can go crazy and get some nice surreal results.
An example of what I mean:
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