Ask for one straight-on photo and one angled case view. The front view should show the blue dial centered within the Roman-numeral track, even hand alignment, and a bezel whose setting appears consistent around the full perimeter. The angled view should show the rounded case, crown position, and the way the bracelet meets the case. A wrist photo is useful at 33mm because it places the compact circular shape in scale before you commit.
The dial should remain easy to read despite the brighter case edge. Look closely at the numeral printing and the transition from blue dial to bezel, then use the side image to judge whether the crown sits naturally in the protected Ballon Bleu profile. Those small visual checks matter more on this configuration than a general glamour photograph.