Great set of shots, very crisp and excellent lighting on the subject. Only little issue I have is with the middle one and the light part in the upper half of the frame, uniformed black like in the others would have been perfect. Nice work either way.
a bit too static for my taste, the right frame seems to be lacking in something, more dynamic needed there. I'm probably not making myself clear here, so I'll just stop and hope you understand what I'm trying to say.
Good series though and technically very good.
The only - hopefully constructive - criticism I can give is that the image on the left might benefit from being slightly darker in its lower left corner. The composition is perfect, as are the colors.A special note about the middle image: I love this combination of the three shades of brown in the angled horizonal layers.
The slanted horizon in the middle picture kind of hurts this...also it seems like the lighting is just a tad harsh on the left shell. I like the idea though.