I took this today with my 70-200mm 2.8 IS, the resulting image was the spaniel dead centre of the image with just as much grass either side of him, in fact double the amount you can see here.
I was stuck as to where it should of been cropped, I took into account the thirds rule and also gave it some space in the direction the dog is focusing it's attention (loosely).
I'm still not comfortable with the crop as picture, but I just can't see why but I'm having a day like that, maybe it's because the slope of the hill is leading in an opposite direction to the dogs line of sight?
Any input welcomed:
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