I've searching on Twitter, and it seems like the backcover illustration of the vol.34 is that one from Weekly Shounen Sunday #8 (2/1/2017).
I don't know whether it is prohibited or not, but here's my source.
And, to be honest? I'm pretty disappointed. Again.
Well, to be honest I was expecting the seven djinns with Arba or something like that. The cover isn't really bad, but what is that with Zagan's coloring? And Aladdin has so much better angles to be explored. I hope she adds a great background (which I think it's quite impossible), because this...