Hello LoisBa ....
A very nice and helpful member of the old forums turned us on to IrfanView, created by a fellow from Switzerland. It is free and easy to quickly download. It makes avatar creation so easy that it is fun.
With this, you can take any picture and turn it into a completely great avatar.
The thing you have to do tho, is reduce it to no more than 80 X 80 pixels in size.
It consists of cropping your picture so you have the part you most want, then sharpening and/or brightening up the image if needed.
You do not need to upload it to anywhere besides BT2. You can only have one avatar at a time to BT2, but you can keep all your other favorites on your own computer. Some people change their avatars regularly, others stick with one or another for longer periods.
Irfanview can be used to edit any kind of picture for any purpose. It is not just for avatars - it just makes avatar creation a snap.