The part where the human is shown. I have the original image in color and want to convert it into the red effect. What is the effect called and what technique is used.
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The image you have attached was not created using an effect - this is actually a well-executed vector illustration. You may achieve similar look in Photoshop but the outcome will be nowhere near the provided illustration in terms of quality.
Image > Adjustments > Thresholdand drag the threshold slider until you achieve a satisfactory result.
For a more detail result, you would have to redraw the image. You can do it in Photoshop, but it'd be much easier in Illustrator.
Steps in Photoshop:
Pen Tool, draw the darker parts of the image.
The process will kind of look like this, excuse my poor execution, but hopefully the idea is clear!: