[wulf]

It can't easily be made to look natural but it can certainly be made much stronger.

I used the curves tool to adjust the values curve - the original looked so light because there was no information towards the left of the histogram and this compressed it down.

I then applied a few other filters:

- a translucent copy set in overlay mode and blended down

- despeckling, then subtle blurring and again adjusting the translucency

- cloning out a white spot on the shoulder area

- unsharp mask

Wulf

ps. All changes done with The GIMP