 Re: How can I make this image into a detailed halftone?
Uh oh...
Pick up a magazine or newspaper and look at it under a magnifying glass. You will see the image is actually made up of little dots of varying sizes. When you step back, the dots will optically blend to fool your brain into thinking it sees continuous tones. That a halftone.
Halftones are printed at a specific linescreen, usually something within the printer's capability. At our shop, our default line screen is 55 lines per inch. Roughly speaking, that means for every inch, 55 lines can fit into it. Some screenprint shops go higher, some go lower. It depends on a host of factors mesh counts, separation technique, etc...
Positive Dave was asking you how high a line count can you print successfully. I can't imagine you'd want to go any higher than 65 lpi.
To set-up your pic for a White Halftone print onto a Black Garment, the easiest way is to place the graphic onto a black background, edit the image until you see the tones you like, change the mode to Grayscale and flatten it. Then invert the image. There's your plate. If you need a base, just make a copy of the file and hit the copy with a curve that reduces the image to your liking. Output the files to film and have at it.
FYI, the above procedure is highly inelegant and not the way I would do it but it would work. | 
