Underwear photo retouching

You see these kinds of photos in every beauty magazine and not only. Here is a small tutorial of how you can edit a glamour, beauty or portrait photo.
The only light source I used here was a softbox with a Canon flash, on the left side of the image to give a soft light.
You can use Adobe Photoshop Elements for instance, since the license for that software is not that expensive. I got mine for free when purchasing a wacom tablet.
Let's start from the original RAW file, which looks like this:

I wanted to make this image black and white, so I did that in the RAW editing. I increased contrast, I applied an orange filter effect and reduced some of the highlights. I did this in Canon's Digital Photo Professional software and then converted the image to jpg.

The first thing I usually do is look at the levels and see where the important information in the image is, and drag the sliders to give it more contrast. You can see that the blacks are on the left side and the whites are on the right. I also adjusted the mid-tones a bit, because the image was too bright.

After the level adjustment, what I usually do is create a new layer and start correcting the skin's imperfections. You want to do this zoomed in to 100% and use the healing brush. The clone brush is useful if you have some edges to correct, straight lines or sometimes if you want to make eyelashes look more dense. You need to be careful and sample the healing brush from near where you are applying it, to avoid making the effect look artificial. The brush size needs to be quite small to work on the small details. This process takes a while and you need to be patient to get the best results.

After you have healed all the minor imperfections on the skin, you can emphasize some features with the help of dodge and burn brush. What I did here was paint a few faint shadows and highlights on the chest and stomach. The changes are subtle but they give a more 3D look.

It is pretty simple process on an image like this, it gets more time consuming on a beauty shot where you have a face as well. Of course you can use a blur tool on the skin, but be careful not to lose the skin texture's details. On this particular image, I chose not to use the blur tool.
Here is my final image: