So, I'm now the Avatar police :p
If any avatar is too wide, or too tall, I will force a resize on them.
But now, you can do it yourself, in your account options, there is now an option to preview your avatar and to set size in width and height.
Those are client resize, mean the picture if 500 kb will be 500 kb even if you resize it to 1 pixel per 1 pixel.
Also, notice that if you don't enter a height, but enter a width, your browser will display the picture in the right proportion.
If you click on "Preview" and no height/width is entered, you will be able to click on the "Evaluate" button, which will calculate the real one for you... so you can adjust it properly.
Typically, width of 125 pixels is the maximum you can have, and I've limited it to 300 pixels in height.
Have fun.

