Just my 2-Pennyworth (re. composition)..

The cat is sitting on the wall and, errmmm, looking at something? Looking at nothing? Looking out of the picture? etc...

Although the camera angle is dynamic (well done there!), the rest seems to me to be static.

Suggestion (feel free to disregard):

1. Move the cam further to the right so that less of the castle, more of the background is in view.
2. Add a second point of interest on or near the ground. Anything would do - a cottage with smoke coming from it's chimney, a dragon, a minor war, a "strange reflecting sphere", a huge dog?? whatever..
3. Change the pose of the cat so it's looking at the 2nd Point of Interest.. Give the viewer something to catch on to..

As for a road, there are several tutorials around on how to do that.
I can't remember details at present, but mostly (IIRC)
Create a height image of the terrain (for reference).
Using a 2D app, create your road as a white wiggly line on black (using the height image to decide where to go). (or it may be black road on white - white raises the road, black lowers it).
This "road map" can then be used in both the terrain editor (using the "pictures" tab and adjusting the blend) to control the way the 3D of the road looks (although I doubt it's needed for a shot from this distance) and in the materials editor to control the textures...
May be sensible to blur the edges of the road (in the 2D app), although again, probably not necessary at the given distance.

That's it in a nutshell. Alas, I've lost mynut-crackers, so no "kernals of truth"...
Cheers,
Diolma