What a smooth picture like that!!

http://www.flickr.com/photos/pootaro/5686435158/in/set-72157626606448046/

http://www.flickr.com/photos/pootaro/5685838705/in/set-72157626606448046/

These pics above were shot by Sigma DP2s in various ISO settings between 100-400, EXIFs are  able to be checked. I must mention that there should be much noise in the picture(especially in ISO 400), but they was erased by the way that I don't know.

These pics looks very "smooth" but with sharp edges, especially compare to the untouched ones like "http://www.flickr.com/photos/pootaro/7533736520/in/set-72157630430289506".

I've tried several ways to perform like that, but none of below was successful.

1. Reduce Noise (or Median) + Sharpen Edges  all by photoshop.

2. Imagenomic Portraiture.

3. Use Oil-painting filters.

Any idea?