After months without Terragen (and I'm still alive!) I made a new render with TG 0.9 and a little postwork with PS. The terrain is made with World Machine.
I like the birds touch!
It seems as though some of your colors are a little washed out where the rays are hitting the terrain.
Even though I'm not that keen on the terrain (I prefer more realism generally), I really like this picture. It tells a story. I can imagine that the winged minions have flown from the tower. The sky is amazing!
monks