In addition to the good advice from 3DCargo, I would say you should change how you render and present you models.
The background should not take any focus from the object you want to sell. Use a simple background as possible, with just enough shadows and depht so it can give the customer a sense off room wheirin you objects exist. Don't let it hang free in an empty space, but don't let the background take away any attention neither.
Ex in "The Bed of the Poor" it's the bed you are selling not the rocky ground it stand on or the background image of a landscape, so there is no reason to show these things.
But if you absolute will show you models with a detailed backgroun, then do it with a more naturral enviroment. F.ex. put the bed in a bedroom, the electric pole on the ground and not above the clouds, and so on.
So always keep focus on what you are selling and avoid making the renders to much dark.