Taken a couple of days ago, there is a lot of noise and banding is this photo, which is surprising. Have reduced the noise in my photo-editor to the level I can do without too much loss. I will go along another day and have another attempt, without two of our grandkids in tow. Settings were f3.5; 12mms (18mms equiv); ISO800; 1/320sec. How would I be best in improving this shot? Next time, use a tripod or monopod? Use my speedlight?