Young girls find inspiration in the size zero pictures of models, which are often, touched up. This gives them the wrong signals to crash diet. Models should weigh the advantages against such disadvantages before allowing or encouraging photo retouching.
Retouching should be taken up only in case, a portfolio is being made or if there is some amount of competition involved. The models should never go in for the retouching technique if it leads to any wrong notion being conveyed to the world. The models should indulge in retouching only if they are very clear about the fact that they are not promoting unrealistic expectations. The normal folk start believing that skin and body are supposed to be flawless and go to unimaginable extents to attain them. However, the right thought process should be that flawless cannot be achieved with technology but by indulging in healthy habits.
In case, the model gets retouched for the good of the image, or to hide burn marks, for instance; the issue does not turn controversial. However, retouching should not be done to defame the image of the model. As long as models can keep up social responsibility and discourage negative ideas, retouching is perfect.