Thanks for letting us see your photos. As an overall comment landscapes
are almost always improved by having a human figure in the foreground.
If you don't have a handy human try and plonk a colourful rucksack or
coat in there! Of course like most rules there are times when this
should be broken.
Taking photos of landscapes with large areas of woodland is always a
challenge. It's hard not to make them appear boring as all you can see
is an expanse of trees (e.g. Jeremy's Run Outlook). try to make one of
the trees a "feature" as in Indian River Overlook.
If you get a chance try and look at a couple of books by WA Poucher.
There are a few images of his if you search Google Images. He wrote
guidebooks to all the mountain regions of the UK and his photos are
excellent examples of what I would call "Classic Landscape Composition".
Lighting conditions - generally mountains look best with strong side
lighting i.e. dawn and sunset. To get the best photos of an area you
will need to visit it many times in different lighting conditions. In
time you can get a feel for what sort of conditions will give you good
photos of an area.
Ian.