Originally Posted by imaginas
I didn't have choices about lightning...In additional the model was in move!!!
I could imagine the challenge with various lighting conditions but you do have choices on setting your ISO, aperture, and shutter. The camera settings you used to shoot the image I have listed on my previous reply. Bumping up the ISO and lowering aperture would have helped bring in ambient light. Bouncing light helps as well.
Sorry, I don't really have a special technique with skin softening. I like to maintain detail in the face so I start off with models with good to great skin. Then I retouch with a combination of healing brush and clone stamp. If I feel I need skin softening, which is rare for me now, I use a very subtle or low opacity of gaussian blur.