1. Log in to your blogger account
2. Go to Design --> Edit HTML
3. Copy this code, and paste above ]]></b:skin>
.avatar-image-container { background: url
("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZjbgiy3BIixef-N2o9HQglWo3HfSM2PoTg4PnsSoib3PJjGjajdfuG9qLXSdXf-u01a0U_8OsxAo1wFl1AZ_THqLqhEX0dt4OLqzWjFJBKNlco3VgmZaV3iZtk596RjBMOYX4aTf7LIQ/s1600/avatar.png")
no-repeat scroll center center;}
=> the red URL is the photo, you can change it("https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjZjbgiy3BIixef-N2o9HQglWo3HfSM2PoTg4PnsSoib3PJjGjajdfuG9qLXSdXf-u01a0U_8OsxAo1wFl1AZ_THqLqhEX0dt4OLqzWjFJBKNlco3VgmZaV3iZtk596RjBMOYX4aTf7LIQ/s1600/avatar.png")
no-repeat scroll center center;}
4. Then? Just click SAVE TEMPLATE
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