My 2 cents:
Aside from the compositing the people/QB/sky, I think the look is pretty much down to lighting and RAW development.
Assuming you get the lighting right, in Lightroom (I’m sure PS has the same controls, it’s just not in my workflow), jack up the contrast and clarity, then use the fill light and blacks controls to clip/compress the image a bit. You can use exposure to adjust a bit if pushing up the blacks clips too much of the image. Drop the saturation relative to how much more contrast you add.
Then use HSL to fine tune – bumping blue/aqua saturation can look great if the clothes are those colors (while dropping the rest), and you can fine tune the tonal range of the skin by playing with red/orange/yellow luminance.
I’m not saying that’s how that one was done, but it might get you in the ball park for the painted shiny look. Oh, and when you’re done in PS, duplicate the layer (or stamp), and set this new layer to Filter->other->high pass with a value between 3 and 8, and change the blending mode to soft light (or hard light if you want to mask it back).
Hope that helps.