your framing of this accentuates the negative.....it's just not even and is very distracting....the focus on the shell appears to be a bit soft as well.
Nice choice for still life, but poor arrangement. The photo frame is not aligned properly, it looks sloppy on an angle. The cloth underneath is buckled in the bottom right corner - a distraction. Ligthing could be improved as well, to create a more dramatic image.
Just a little soft on the focus, but the idea is so so good. Wow. Not sure I'd of thought of this in 100 years. Great idea, and composition.The backgroud could of been improved (red) a bit. Your lighting is very nice and adds to the over all shot. Creative and good eye.