Display Profile Picture of Users - django

Question

I am trying to display the profile pictures of new users registered to a website to show to every user logged onto the website and so far i have been able to display their username but i am having difficulty displaying their profile picture stored in an extended model User profile. How do i make this happen to display it in my templates. A better solution is welcome
Profile_tag
def person(context, e):
"""
Renders a single user object.
"""
to_return = {
'user': context ['user'],
'profile': context['UserProfile.objects.all'],
}
register = template.Library()
register.inclusion_tag('profile/person.html', takes_context=True)(person)
Person.html
<div class="person">
<a href="{% url 'profile_detail' user.username %}">
<span class="username">{{ user.username|slice:"12" }}</span>
<p> <img src="/static/assets/{{profile_picture}}" height="100" width="100"></p>
</a>
</div>
user_list.html
{% load profile_tags %}
{% block main_content %}
<h1>Newest Users</h1>
{% friends_for_user user as friend_dict %}
{% for person in object_list %}
{% dict_entry_for_item person.username from friend_dict as friend %}
{% person person %}
{% ifnotequal person user %}
<form method="POST" action="{% if friend %}{% url 'sg_unfollow' person.username %}{% else %}{% url 'sg_follow' person.username %}{% endif %}">{%csrf_token%}
<input type="submit" value="{% if friend %}Unfollow{% else %}Follow{% endif %}" />
</form>
{% endifnotequal %}
{% endfor %}
Urls.py
urlpatterns = patterns('profile.views',
url(r'^detail/(?P<username>[a-zA-Z0-9_-]+)/$', 'detail',
name='profile_detail'),
)

Answer 1

profile_picture came from where ?
Extended user model Profile user Foreignkey with User then
models.py
class Profile(models.Model):
user = models.ForeignKey(User)
profile_picture = models.ImageField(upload_to='uploads/avatar')
views.py
userDetail = Profile.objects.get(user_id=request.session['_auth_user_id'])
templateVar['profile_picture'] = userDetail.profile_picture