I think Max is referring to the difference in visual quality between the grass, the leaves, and the rest of the textures. It doesn't matter how high-quality the digital file is if the focus was soft in the original photograph! There is also a mismatch in the hardness of the edges of the roots vs the sharpness of detail in the wood texture.

The thing that kind of bugs me is that the roots are running over the leaves. The leaves should be on top, with the roots peeking out from beneath them, except in places where they're clearly lifted up out of the dirt.