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The way I understand your problem, date is just a key in an array of image paths. The following code changes the fill attribute of each circle, in function of its index i in the data. It should be a good start to solve your problem.

var images = ["img1.png","img2.png","img3.png"];

   .style("fill",function(d,i){ return "url(" + d + ")"; });

This is a good reading regarding the use of d3 enter and exit

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