What sense of reality have you constructed in each case and who is included and excluded as a result?
I cannot really say if my school magazine is realistic because I have not studied deeply or seen many others, but I expect it is at least fairly real because it features school things as well as entertainment features to make the students want to buy it.
As for the music magazine, I think it is realistic as it features all the conventions of music magazines and is targeted at one audience. Plus I think it features realistic magazine features.
Also, my fictional rap group “HaterProof” on my music magazine, had to look realistic so I had to get the right image. Making sure stereotypical conventions of the genre were met (jewellery, hoodie, jeans, etc…), meaning I had to be selective about who was featured, eg: someone in a suit and tie would not look right for it.