I'd look at the grass in Dota2 as an example, even if it's suppose to be simple, there needs to be enough contrast and details to make it interesting and read like grass.
Sorry for inform you that this is Indian version of fiat 1100D and in india name of this car was Fiat padmini. Here is some example there is no window triangle.
For a living person it's better to scan using multiple cameras setup. My example of game environment, mostly photoscanned http://i.imgur.com/nxZQAZe.jpg