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Hi Gerardo,
There are 5 images at "root/components/com_community/templates/default/images"
karma-0-5.png, karma-0.5-5.png, karma-1-5.png, karma-2-5.png, karma-3-5.png, karma-4-5.png, karma-5-5.png
All you have to do is to replace these images but keep same file name and resolution.
Thanks