If you already have an older client, you can download the latest android version instead which contains compressed images and is significantly smaller.
Rename the downloaded .apk to .zip, and replace the
game/app.asar.unpacked/sprites
in your existing glamour offline directory with the
assets/sprites
from the .zip
Then, replace
game/app.asar
from your existing glamour directory with
assets/app.asar
from the .zip
Additionally, not strictly required, but I would also recommend you apply my unofficial 0.31 bugfix from
HERE.
Now, you have an updated client with compressed images