Agree with Sai, looks a bit unfinished. Well done though!

The palette looks unbalanced (even saturation maybe, or low contrast? I didn't check).

What is that specular on the right side? a hint that this is a robotic foot? ;)

 Wonderfull, i love the dithering effect.

But i recomend you to change the space betwen 1 and 2d toe.

The nail on the second toe seems a bit misplaced. Something about the grass bothers me. I think it's because of the lack of depth/volume. There should be larger stalks in the front to show perspective and make them smaller as they fade out into the distance. Sky could probably use some clouds curving in too.

Stinky ... Cuter

That's some fat, ugly foot :)

The technique an level of realism are good!

 Good ;)