WordPress Author / User Image lets you set author image.
By this plugin you will be able to set author image.
Ability to remove user image or block particular user. (New added)
This photo will be appears below the post in about author section and also in there comment. When you have many user your user’s will be able to set there photo. It appears in comment. You have ability to resize the uploaded image. So no extra disk space or bandwidth will be loss. The most Amazing part of this plugin is you can set a default image for your user. If any of your user not set there image then show the default image.