A lovely shot with great DOF I agree that you could adjust the curves, but I think the image is well composed as is and cropping will not improve it. The verticaity of the photo would be reduced . .
I like the idea of glimpsing this monk between the stones and I love his expression. :)
Suggestions: If it were mine, I'd probably crop a bunch of the white sky from the top, just leaving him some headroom, and a simple curves adjustment would fix the slight overexposure.
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