Hello, Adil123,
Unfortunately, modding the images is not possible on mobile devices (either iOS or Android), even if you have access to your device's file system. The images have been converted to a proprietary compressed format to keep the app size as small as possible.
However, to answer your question about the location of the image files (in case you care to examine them), they are contained in the game's app folder, along with the sounds and other control files.
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Barbara
Unicorn
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