Attached Link: http://www.petersharpe.com/Tutorials.htm

Read everything you find at the attached URL. Use lots of little pieces and tweak. It comes but it takes practice, practice, practice. Sit down with a single element and work your tools so you can understand them, then use what you learn in a scene. If you start building a big scene you have to wait too long to see what your changes actually do. I needed a shale texture, so I grabbed the arizona texture and started tweaking the presets. I needed brown leaves so I loaded the orange and played with colors. I kicked down the specularity to make it look dull. When it was too dark in the shadows I upped the ambience. I rarely use the presets as-is anymore. Lots of objects add complexity. Use several terrains. When you want a rock add a bryce rock instead of trying to make the terrain do it. Big photo textures can help. bryce procedural wood stinks. Take a picture of your coffee table and use it or load a texture from the internet. Hope this helps:)