There's a lot of what I want to call "hard lines," but I'm not sure if that's a good description or not. The place I can point it out the easiest without actually circling them: on the top right, you have vines crawling down the cliff face; go to the rock at the bottom of them - the first one I'll point out is the shadow at the bottom or it, then look to the grass immediately below it, where that itself connects with the shorter grass tiles - there's a very visible and distinct edge of different shades. There's a couple places on the left hand of the shot at well, that look more like tiles that don't quite tile correctly, and at least one place (the tree near the top by the water) where a portion of the shadow disappears entirely and leaves a hard line.
But those aside (and the only detractions I can find are the hard lines, and only because I was drawn to them immediately), it's damned gorgeous.