Use google to find a website that specialises in avatars. There are literally thousands.
Choose one, save it to your desktop somewhere. Then using the User Control Panel, select it form your desktop.
It should be less that 100x100 pixels from any of the avatar websites.
Failing that, send me and pics that you want, and I'll resize them for you so you can upload them.
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On topic. Great offer Ian
I've resized to 100x92 but the picture is too big, max is 6kb, but I can't get it below 22.Xkb no matter how low I set the quality