Oh I love the Matryoshka-dolls! I used to play with them when I was little :)
The small DoF really works in this photo, especially with the different layers of the shells of the dolls. Colors look nice and the light is good. Only thing I might have done different is the alignment of the head of the doll. Because of the DoF you lose the sharpness on the right eye, if you place the doll with the eyes straight to the cam that might have been better.
Nice and simple. I like the composition. Something seems a little off to me with the coloring or something... perhaps a little overexposed or pale? Not sure... nice job though.
I love this shot! I think the shallow depth of field is great with the softening rings, but I wish on the whole doll the near eye were as sharp as the far one.