Just saying ahead of time, I'm not trying to be offensive in any way.
You talk of originality but all the links you included show furry/dragon art (one of the most common types of art, on DA and elsewhere). There may be variations in each piece, that's true, but they all basically contain the same concepts/ideas.
Also, most of them don't really have an interesting pose, point of view, or even a background.
in my opinion, an original piece opens up people's mind to new ideas, make them think in ways they have never thought before, or at least show something that would be difficult to put in a common or overused category.
however, dragons, for some reason, kick ass no matter how overused they are. -_o