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foreground interest in landscape

Not wrong just not the norm, experiment it's up to you after all. 
It's just like the rule of thirds, our eyes/brains are made up that way and we like to put things into a kind of symmetry but whatever pleases you personally is ok.
Sometimes a seemingly empty foreground can be used to give a feeling of space or desolation to great effect, or if you want to concentrate the viewers eye on a main subject that is far off/in the mid/background, less is more so to speak..
Cheers Jules...

It's just like the rule of thirds, our eyes/brains are made up that way and we like to put things into a kind of symmetry but whatever pleases you personally is ok.
Sometimes a seemingly empty foreground can be used to give a feeling of space or desolation to great effect, or if you want to concentrate the viewers eye on a main subject that is far off/in the mid/background, less is more so to speak..
Cheers Jules...

Quote:i would like to know is an interesting foreground is a must on landscape photo?
No, it is not a must.
Quote:is it wrong to put point of interest in mid or background and leaving the foreground empty.?
No it is not wrong, some landscape photos don't even have a foreground and are perfectly fine without one.
However, if you intend to include a foreground in a photo then it may as well be interesting or have a function otherwise it may be superfluous to requirements.

Many landscapes are helped by some foreground interest, but I feel this is sometimes overdone, so that the foreground dominates , and it is not clear whether the foreground or other elements in the scene are the intended focal point for the viewer.
It might be worth searching for "landscapes" in Google Images, which will bring up dozens of examples to consider and get some ideas from...
It might be worth searching for "landscapes" in Google Images, which will bring up dozens of examples to consider and get some ideas from...

It all depends on the lens you are using and I would generalise by saying the wider the lens the more important foreground/miground object is. The widest commonly used focal lengths are 17mm on 35mm camera (10mm on APS-C, 8mm on MFT) a distant bacground is very small in the frame and you need foreground elements to give the eye something to latch onto and stop pictures looking repetitive. But as has been said, it may be an effect you want occasionally.