Your example is a textured 3D model or someone who has respectable 2D graphic software skills has warped an image to look out like it's a 3D model.
You already have got an answer which shows how to modulate the brightness of a cloud of dots with a photo of a face. If the face image has deep contrasts and the dot cloud has irregular distribution, some 3D -like effect really can be seen altough closer look reveals that the dots still are in the same plane. Careful warping could fix it, but it's not easy. I skip it and suggest something else:
There's a totally different way to build the face like it's made of glowing dots. All dots are as bright, but their density varies along the local brightness of the face image. That's called halftoning. It's used in printing and in many drawing and engraving styles to simulate grayshades.
Photoshop has several high quality halftoning methods. One of them is Diffuse Dithering. To use it the photo must at first be converted to grayscale.
A good contrast is generally a must to avoid grey or washed appearance. Just in your case high contrast is bad because you want to keep white dots separated, large contiguous white areas are not wanted. Here's the original BW photo and and the low contrast grayscale version (it was desaturated RGB image, but the mode is changed to grayscale):
The low contrast version has got full black background and it's max. brightness is about 40% of full white.
After applying Image > Mode > Bitmap > Diffuse dithering the result is this:
It looks out grey, but the dots are full white on black. Zoom in to see it.
You wanted glow. If it's colored, it will not melt white dots together, the image is still made of dots and looks out substantially less grey:
Inserting the glow needs a little work:
- convert image back to grayscale and then to RGB
- convert the background to layer (=double click it in the layers panel)
- select all black with the magic wand
- press DEL, white dots remain
- insert a new bottom layer, fill it with black
- insert Layer style "Outer Glow" to the white dots layer.