Askbot supports a number of optional modules, enabling certain features, not available in askbot by default.
To enable uploadable avatars (in addition to gravatars), please install development version of application django-avatar, with the following command:
pip install -e git+git://github.com/ericflo/django-avatar.git#egg=django-avatar
Then add avatar to the list of INSTALLED_APPS in your settings.py file and run (to install database table used by the avatar app):
python manage.py syncdb
Note
Version of the avatar application available at pypi may not be up to date, so please take the development version from the github repository