Portrait retouching and beauty retouching are almost similar except portrait retouching needs to be retouched with the whole background. Generally, portrait means taking close range picture of a person. Therefore, retouching portrait needs extra attention so that it looks as real as possible and we are expert at delivering it. If you want, you can go and read about related service of Product Retouching.
Portrait retouching helps to remove the spots on the face to get more natural look
Portrait retouching helps to remove any blurs from the background to get more instinctive look