Hello Petrache Nicolae,
Yes you can change size for profile photo. Go to ftp:classes>>rlAccounts.class.php find method with name: editProfile and code:
change parameters 100 it's width and second 100 it's height.Code:Only registered members can view the code.
IF you want change width and height for logo on registration page go to Admin panel >> Account fields and edit new created field 'profile_photo'