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Icon Design
You might think you want to change the icons, and that's great! Here's how you can do icon design.
For iOS apps, you need to export at a set of resolutions—these are in the ios/AllAboutOlaf/Images.xcassets/AppIcon.appiconset/ directory.
As an example, the Icon-40@2x.png image must be exported at the size of 80x80, and should be visually the same as the Icon-40@1x and Icon-40@3x variants.
When you upload a new version of the app, these variants will be adopted by the store presence, so this is all the work you need to do.
Android is a little bit weirder.
First, the icons are referenced from android/app/src/main/AndroidManifest.xml, specifically the android:icon key.
This file takes the form @mipmap/ic_launcher; depending on device size, @mipmap gets matched to the appropriate mipmap- directory in android/app/src/main/res, or, if the device is running API 26+, the mipmap-anydpi- directory is chosen if present.
These directories can reference a @drawable, which will be filled in from the appropriate directory as well.
The Play Store icon is subject to different constraints, so you will want to make sure that you update that as well.