Attached Link: http://www.renderosity.com/mod/gallery/index.php?image_id=1788732

This has been discussed in lots of threads in this forum. Do a search by terragen restricted to the Vue forum, if you're interested in reading these discussions.

I would say it is possible to get a similar look in Vue. As in most renders, lighting and materials are key points. The first thing that strikes me in your image as not similar to Terragen is your lighting. It seems to have soft shadows but Terragen renders normally have sharp shadows.
Another thing is the terrain material. Yours has little high frequency color variation, compared to Terragen's. In other words, your material doesn't have as many details as Terragen's.

Personally, I don't try to pursue a Terragen look in my renders. I think each app has its own look and I find a bit pointless to try to achieve in one the look of the other. I mean, if you want to do that, just use the other app. :-)

I just made one exception, the image linked above. Here I more or less tried to achieve a similar look. I wasn't 100% successful, but if you're interested I can tell you the details of the lighting and material I used.