Nikon d60 , 18-55 at 55mm , f 5.6 1/60 , ISO 250 and TTL flash lo~
why?
Your exposure settings without the flash, will probably not give you enough light to properly expose the image in the first place.
The flash will only illuminate what it can from the front, so obviously the rest of the image, like the background and so forth, will be of the exposure level that you would get without flash.
I'm guessing you shot this on P mode?