look here for some example 3D renders (not TFP)http://www.cornucopia3d.com/galleries/displayimage.php?album=14&pos=15
I'm not knocking TFP nor suggesting you look at Vue as a replacement tool...
rather, look at these to see mostly very good 3D scene renders for ideas and/or for how well it can be done and compare your own TFP renders to look to what can be improved in your own work . . . especially for landscapes/vegetation
Sometimes renders look very real, other times not so much when you want them to, and other times you don't want or need reality such as typical SU renders here: (perhaps this is why they named it "sketch
search www for "sketchup examples sketches" (URL not pasted as it is about 30 characters long)