First, we'll create convert the image to blocks using a combination of Photoshop filters.
1. Open a photo you would like to edit. We recommend using a high resolution image of at least 1000x1000 pixels. It is also fine to upscale a low resolution image before using this effect.
Duplicate the layer (Layer> Duplicate Layer or Ctrl+J).
Activate the top layer and apply a Mosaic filter (Filter> Pixelate> Mosaic) with a cell size of 16 square.
Apply a Find Edges filter (Filter> Stylize> Find Edges).