Oh come on. All this hate for CGS? As has been commented. They look for different things in their art. Focal points, stories, something that stands out. A lot of landscape photography and renders, for all their technical impressiveness tend to lack these same qualities. No aspersions on the amazing stuff I see every day in this very forum. Include humans, animals, or something else in your renders, make them do something interesting, and all of a sudden, you'll notice more interest.
If you want to submit renders plainly, then I suggest you look to submit into a similar field. A photography or terrain rendering forum.
Additionally, Terragen renders could be used in conjunction with photoshop for some impressive Matte paintings, no?
Before you get annoyed, think about where you're submitting, and what they're going to notice. I've seen some awe inspiring terrains somewhere round the place, they get through, but they sort of have to floor you at first glance.
Of course. Nobody will complain if you include airships... You know. The Steampunk ones.