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Mike Veitch:nice set of images, that lobster is very cool! never see them in the open like that over here.
Can i give a suggestion? Quite a bit of shadow on pics 3 and 4 from keeping your strobe way off to the right.
When shooting vertical try to bring the strobe back up over top of your camera so it is in the 11 oclock to 1 oclock area. This will cut down on the harsh shadows.