Thanks everyone for your feedback.
Russ, Ed...I agree it is unfortunate the second guy is behind the other, he is a trainee following the 2 trackers....yes, there was a 3rd one but I'll get to that in a minute. Also note the feelings that it would have been better landscape. I felt at the time the shot lend itself to portrait, taking the road from the bottom to the top encompassing the dead tree and some of the other background trees....and I still believe that. If I'd composed further to the right, I'd have lost the good light on the vegetation to the left, and I think this would have made the image lose something very important...further, the vegetation on the right was in shadow and quite dull. I did frame landscape through the viewfinder when deciding which way to go and saw that the top right quarter was dull and empty....if I tried to reduce that, I cut off half the dead tree.
When I saw this shot evolve, the trackers were just behind the bend....I decided the optimal time to take the shot was when they reached the point of the bend. Waiting for this and dithering about landscape/portrait nearly made me miss the shot altogether, as by the time I reset portrait, the 3rd tracker half stepped out of the frame and I had to just trip the shutter before the opportunity was gone. I can't remember if I tried zooming out more after this shot, but my guess is I did and decided against it. Nevertheless, after cropping out the half tracker, I think I ended up with a good result and by the comments everyone seems to agree.
Cheers
Brian