Hey Tom! Nice to see these pop up. Like the fact that you are not just focusing on the actual composition but drawing the objects you aim to feature in it and adapting them to make them complement your concept better. I especially like your 3rd image down with the low angle shot adding more drama to the scale of the structures and I can easily see a foreground, midground and background blended together. :)
Yep - Emma is spot on. The third image is fab. I think widening the canvas will really sell the image further.
I like the third one too, but I like the way the little people in the 4th one give it such a sense of scale.
yes, Tom - you need to go PANORAMIC/CINEMASCOPE - really push your canvas into the widescreen and see how your scale opens up and out...