Not a bad try..
Im sorry im rating abit low but, your mountains look too unrealistic, there smoothish and dont look like what a mountain should look like.
Try adding roughness and making the mountains look abit more fitting to the surrounding water.
But after all Art can be anything really!!
But on the otherhand, i love the sky and the clouds. Looks really nice.
I know you havent used Blender for this beacuse its a Terragen render.
And i also know its not Vue beacuse Vue has diffrent water and clouds.
Anyway, Keep on trying, look at some of my work. see if you will get some inspiration