::HAFS Would it make sense to leave in the word "especially"? And leave out "and"? (I've crossed them out in the definition, above.) Also, I assume that what immediately follows "the depiction in art of landscapes" is a kind of definition of "landscapes". If I am correct, I think it would be clearer if I changed the comma after "landscapes" to an en-dash. With these minor changes, the sentence would read: 

 *Landscape painting, also known as landscape art, is the depiction in art of landscapes – natural scenery such as mountains, valleys, trees, rivers, and forests, especially where the main subject is a wide view – with its elements arranged into a coherent composition.  

 ::Just an afterthought: as I read this, I realize that this definition does not include the elements of an urban landscape  a city with buildings, streets, cars, buses, trucks, etc. What do you think about that?