Taking stealthy footsteps on tiptoes…. a long, silent step!!
Sarada saw the photograph!! And then under the supervision of Naruto….!?
*** The のもとに is a construction read altogether. Can also mean ‘on the basis of’ or 'underneath’. I don’t think the もと should be read separately as 'origin’, TBH.
A supplementary file
ダブルポスター！！ The NEXT!! Generation ポスター!!
Double poster!! The NEXT!! Generation Poster!!
(referring to bonus with the magazine, I think. Maybe it’s referring to the new Uzumaki family double-spread poster that was rumoured by 2ch. It’s supposedly a re-make of an old Kushina/Minato/Naruto cover. It just debuted at the exhibition).