You're not obliged to include everything that you see in the landscape you're painting simply because it is there in real life. (In fact, I’d go as far as to say that if you do this, then you might as well take a photo and have it printed on canvas.) Be selective, include the strong elements that characterise that particular landscape. Use the landscape as a reference, to provide you with the information you need to paint the elements, but don't slavishly follow it.