There are so many applications out there that create photorealistic renderings of SketchUp models; it's nearly impossible to know them all. And these apps can vary greatly in price as well as learning curve.
I was asked recently to review a very simple renderer for SketchUp called Visualizer, which is a neat little program. I used the free trial version, but the paid version is only $19.99, the least expensive renderer I've seen.
And the photo area works right inside SketchUp, in real time.
Here's the first example I tried - a SketchUp model of a simple set of toy blocks I downloaded from the 3D Warehouse. As always, the model has a cartoon-like feel in SketchUp, even with edges turned off.
Here's the next one I tried, a house with trees.
Visualizer is a good one to try!
Anyone can design anything in 3D! http://www.3dvinci.net/