Looks great Brian.

One thing though, the dirt sticks toghether a bit more from what I know, it creates more of a streaklike pattern (not wholly so, but a bit more than you have right now). I guess it depends a bit too, if its a bit muddy, the splashes creates streaks, but if its just a dirt road, its more speckled. Hope you understand what I mean, my brain is not completely attached right now. Good luck