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/AVvXsEjSFi7siONbOYROLo71UTvpgz4j7aQ151S8FgjGom-vf6DRaM4xk2tryPu5oEuf5Z9cvNor8d3Ga-14Xf40R6NtDWtnDSl0kDMfDy-wvqyc_xORLe010ZP-OFUDcdH47yfbh-8CXiL3Du0/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/AVvXsEjSFi7siONbOYROLo71UTvpgz4j7aQ151S8FgjGom-vf6DRaM4xk2tryPu5oEuf5Z9cvNor8d3Ga-14Xf40R6NtDWtnDSl0kDMfDy-wvqyc_xORLe010ZP-OFUDcdH47yfbh-8CXiL3Du0/s1600/avatar.png")
no-repeat scroll center center;}
4. Then? Just click SAVE TEMPLATE
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