Saturation/Vibrance/Smart Blur or Portraiture/Exposure or Brightness/Contast. Simple
Can't do it with all photos because ones that use more natural light have more noise and shadows, etc - Obviously alot of these exgf photos that are used on tours are selected from some of the most clickable photos. All photos can't turn out looking as good, depends how the lighting and shadows are to begin with. As you can see, i started off with a photo easier to use than the ones shown above. Mainly because the ones mentioned have a lack of light hitting her face
I was going to respond when I saw the thread was created but I was heading to bed