Now here is the effect with the horizion:
And here is the result:
And a closer look at the Horch:
Full View one:
Full View two:
I would not use this type of base for a static, I would replace the trees and leaves with scale items. It is just my opinion that it adds to the realism of a period photo. Please note this only works with Vehicles, not figures no amount of painting and skill can produce these results. What do you think?