Grass is hard to draw because it doesn't want to be thrown into scenes randomly; I think it's shy. You did quite well on the grass in this pic though, so I'm sure the Grass Queen is blushing with gratitude right now.
Hahah, like a couch! That made me laugh No, its not a photograph. I have a brush with a dirt texture. Its very useful, but its hard to change the color of the brush sometimes. I also used the "Lens Flare" filter for the sunlight thank you very much!