I'm trying to figure out, how to recreate the effect used in shapes 2 & 4. 1 and 3 seems to be simple halftones. 1 & 3 though are made with the perfect dots (not like a usual halftone) while they still reflect highlights and shades of the source image.
I have tried to use Bitmap > Diffusion Dither and then bring the result to Illustrator, trace it and use Convert to shape > Ellipse and it somehow works, but does not produce so neat result as this on the original artwork.
How can I do it cleaner?