Some macro shots of some clam shells.

Canon D60, EF 50mm 1.8 II, Calman +4 Macro Filter...

http://i11.photobucket.com/albums/a183/almoagain/D60%20II/Still%20life/CRW_8516.jpg

http://i11.photobucket.com/albums/a183/almoagain/D60%20II/Still%20life/CRW_8506.jpg

http://i11.photobucket.com/albums/a183/almoagain/D60%20II/Still%20life/CRW_8513.jpg
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Almo, the bottom shot has potential as an abstract. It look squite interesting, and menacing. The top of the two shells is just a bit dry and not creative enough to keep me interested in looking. The sharpness came out fine, except maybe the front of the top shell should have been in focal area. I think it was positioned too much in front of your focal point.

I agree about the bottom, that's awesome. I also like the middle one.

For #1, i'd crop from the right, my hand-crop looked good anyway