It's to complicated. Look up something to do with noise, like reducing it. To much thinking. Easier to set the ISO to 200, and make the flash's batteries die quicker. Or edit the picture.
Where the noise is in most of the pictures I took today, are they considered shadows? No idea. I don't see any shadows.
Will putting the camera on auto do the trick? If it doesn't pick an aperture of f8, the picture won't be as sharp.
Best picture of Pumpkin I took today, probably one of the best pictures I took. I was close, so the noise didn't kill the image.