An avatar is the image that you represent yourself all the summer, the maximum sizes are:
-Width: 150 pixels
-High: 200 pixels
-Weight: 64 Kb
The signature can be activated and at the end of each of the messages that poles, the maximum sizes are:
-Width: 500 pixels
-High: 150 pixels
Take into account sizes because if you exceed the limit if only one pixel by the blot of your profile, although your bar of misconduct will continue intact.