Retouched image to show case makeup
A makeup artist can use makeup to cover skin imperfections before photoshoots. When that isn't enough, the photographer can consider retouching to improve the images further.
An image that shows the before after of a model with both make up and retouching work done
For photography involving people (e.g. business portraits), basic retouching would usually include removing blemishes, lightening eye bags, and whitening teeth. Extensive retouching may reduce double chin, body slimming, eliminating stray hairs, adjusting clothes, and even cleaning up the surrounding area.
