Google Gallery (flower)

You might expand on this a bit. Can you tell us how you did this?
 
You can't uninstall the Gallery. It's a System app. You can remove it from your home screens.
Check if it's somewhere in your app drawer (9 dot button on the bottom right of your screen). If it's still in there, just hold your finger on it, and it will pop back out to your home screen, just drop it where you want it.

If it's REALLY not in your app drawer, I would like to hear what modifications or software you were using when you deleted it.
 

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