Im new to the Graphic Design Stack Exchange but I am trying to duplicate the filter used in this picture in photoshop. I was close using Pixelate < Pointalize but it still doesnt work.
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Easiest way to do this is by using overlay layer with texture.
Heres some textures you could use http://blog.spoongraphics.co.uk/freebies/free-pack-of-12-distressed-halftone-pattern-textures
Just put it on the top of your current picture layer and find suitable blending mode and opacity and you'l be all good