Post iOS 8 installation, my iCloud capacity quicky filled up and I couldn't figure out why... I turned off photostream on my iPad, iPhone, and Mac via the settings apps, yet photos still consumed a massive amount of space. Well today, I opened up iPhoto on my Mac, and saw that photostream was still enabled, despite having turned it off in the main settings menu. Anyway, I turned it off again in the iPhoto preferences. After syncing my phone with iTunes, I found photos went from 6gb in iCloud to 3gb... Worth a try!