Photographers

i am a novice photographer, and have a question about the pics of a lot of the models on this site:

the models seem to be flawless…meaning their skin appears near perfect. now, i know in the age of digital photography they can make adjustments with photo software, but my question is it possible to get this appearance with a diffuser filter?

here is a pic i took of my youngest son, while messing around with a diffuser filter… i have not used it much, so i have not experimented with different lighting, etc…

The picture is a tad bit overexposed. Drop the exposure down a stop or two.