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The image looks cyan, looks like it was lit with a mixture of skylight and light reflecting off green foliage.
It is hard to look past the subject during capture, especially when you have a handsome subject like this. You'll have to spend some time consciously looking at the background in the viewfinder, then moving your subject or the camera accordingly. This could possibly be cropped as a vertical, the normal orientation for portraits, and in so doing you would lose the bright area on the left.