To call your work "nature art," you must move past the taboo against editing. The camera captures data; the artist interprets it.
In human art, we study gesture drawing. In wildlife art, look for the "in-between" moments. cupcake puppydog tales artofzoo link
If you want to sell this work, avoid stock photography sites. Art buyers are looking for limited editions and fine art prints. Build a portfolio that focuses on a cohesive theme—"The Fog Series" or "The Last Trees"—rather than a random collection of "good shots." To call your work "nature art," you must