its a nice shot, but I felt it needed a little tweaking so I took a quick stab at it in LightRoom.
WB was a little too warm for me, (i went temp -14 and tint -6 from original) and I also dropped the red channel a little. (+30)
this made the picture a little cooler and got rid of the red tint.
(some people prefer warmer photos, some cooler...to a degree, WB can be subjective)
If you like the shot warmer, you can leave the WB as-shot, but still bring the red channel down a bit. I prefer my shots cooler, so
I adjusted as such.
I felt the horizontal shot worked for this, but I went with an 8x10 crop keeping the boy in the left third of the frame.
It also made the subject a little larger in the frame.
I could have gone a little shorter, but on this shot i decided that I liked the stalks in the background to be fully visible.
overall, I think this was nicely done as far as pose and location go.
focus looks pretty good, but might be just a tad soft at 100%.
LR shows this shot at 170mm, ISO100, f/2.8, SS 1/500th.
i think i would have gone f/4 or f/5.6 on this shot for a little more DOF and maybe a slightly sharper focus. at 1/500, you had plenty of room to adjust shutter speed to compensate and still keep the ISO at 100.