@photojoe, 

The "large" scene size should only really be used with landscapes only. The 'medium' size is what you'll need if you are working with Characters or objects. 

The scene sized only effect 2 things: 1) light/cloud effects and scaling, and, 2) DAZ content scaling to match the scene. (non-DAZ imported content will ignore the scaling parameters on import)

So, working at the medium size is typically what I do when there is more than just a landscape involved. 

Mark