Here is something that I did to spice up a basically high key image. The color filter is not necessary, just the icing on the cake :)
Workflow: Noise reduction, curves, depth of field brush (PhotoKit sharpener plugin), clone out the branch, saved as master file, applied Nik Color Efexx Select 3.0 plugin, dual filter, saved again as master file #2, cropped, re-sized and sharpened.
Hope you guys like it :)