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iCloud storage would not appear on your iPhone , except in Settings->Account(top of serttings)->iCloud.
Buying iClpus storage has no effect on you iPhones physical onboard storage.
With that said, blurry pictures may be due to a bad internet connection, so they don´t get downloaded to the iPhone correctly. No amount of iCloud storage would fix this.
Question: i bought 50GB of extra iCloud storage as my phone said it was nearly full. But the extra storage isnt showing after turning on and off??