Sea Shells (Stacked Images)

This is a stacked image of the sea shells made up from 17 separate exposures in Photoshop, as you can see from the previous image, how much more is in focus with the stacked image , You may notice that part of the large shell in the foreground is out of focus, my error I should have started the focus stack by focusing on the nearest part of the image.

Exposure :- 1/15 sec @ f11 ISO 64