Often times when someone wants more pop in an image, they are referring
to more contrast and sharpness. This image is at the limit in those areas, so
next on the list is saturation. Sometimes I'll have a flatter original and paint
on the highlights.
I don't have FB and can not see any example but in order to get some "pop" out of your photo in most cases, you would most likely need to work some level of contrast. Either exposure contrast or tonal/color contrast or both.
Pre-visualizing and setting up your subject and their surroundings before you shoot will save you tons of editing time for this.
You seem to have a contrast problem with the image. Background is pure white and dress and shoes are pure black. The reason your image is not popping up is the skin/face and background shadow is not contrasty enough compared to the black and white points of the image. That is why your image is looking flat.
A simple trick is to Duplicate Layer-> Desaturate -> Highpass with Large Radius (depends on the image size, for the jpeg copy ~50 did the trick) -> Change mode to Overlay.
While still in raw conversion - I'd try bringing the black point up a bit to bring back some of the dress detail. Maybe increase the clarity.
Then in PS compress the range a bit using curves or levels to enhance the contrast some.
I will sometimes just try copying the background and setting the layer to screen, then adjust opacity to taste.... this brightens the skin and gives it a bit of a glow - you can add a mask, invert it and paint in the effect where you want it if desired
increasing the black level in your neutral tones in the selective colour tool, or adding a curve layer adjusted for contrast can help as well
with so much near white and near black, a good candidate for a *subtle* complimentary tone (or nearly so) cross process (cool shadows / darks, warm lights / whites) - easily done in curves or the selective colour tool...