No photo available in myapps application panel
The AAD Application panel is making use of the AAD thumbnailphoto attribute. In most environments this is a different photo as the O365 photo.
It would be a good end user experience to provide AAD admins functionality to configure which photo can be used: O365 photo (can be set with Outlook web, Skype or Delve) or the AAD photo (which can be synced from AD on prem and is also current behavior).
The other option would be to provide an option to sync O365 photo to AD on prem, which then would sync back to AAD. Less preferred in my opinion.