Try using more light. You can have more light which gives the impression of darkness but does not push your camera to create the digital junk. If the resulting dark areas are NOT dark enough you can post process them to make them darker. Otherwise I think you could blur the background which will get rid of a lot of the weird dots. I hope you don't moind me adjusting your photo. But that is what I tried to do. Basically I selected regions and applied the blur filter. Then redrew in blending areas. Bsteph