I think there is a bug with the Duel Image Maker:
The Challenger and Defenders names are the wrong way round.
It is currently showing the Defender first alongside the level info for the Challenger.
Also, if you K.O. someone it does not show in the image.
e.g. in this one where Raggy Paggy passes out, Raggy is the Level 25/37 player and I am the Level 31/38 challenger.
(I wouldn't normally hit someone with a lower level but he deserved it and also I was level 37 but went up due to this duel)
So I think you need to swap the names around and put Challenger on the first line. Then include if they pass out or not as it's quite important info.
Aside from that, as a cosmetic thing it might look better if rounds 1-4 were all on the first row with rounds 5-8 on the row below - it would be much easier to see where they are aiming that way.
Apart from that I like it and a few players have started using it in my town.