HI Betty, if image still has 3 boost on it then it will get at least 3 duels. It can take some time for image to get duels, so if duels are not "spent" in minutes or hour, that doesn't mean they will not happen.
I actually just cleared the 3 Boosts, and then spent 45 credits on 25 more Boosts. Really hoping this puts the image back in the game ?
The other two photos, submitted at the same time, are both at 500-600. This one is stuck at 180, because it's not being given any more ImageDuels.
8 Duels ?? :/