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Well it appears that it is quite easy, just follow the steps described in the userena FAQ to add some extra fields to forms and in the new forms.py put something along the lines:
from django import forms
from userena.forms import SignupForm
class SignupFormExtra(SignupForm):
avatar = forms.ImageField()
def save(self):
new_user = super(SignupFormExtra, self).save()
profile = new_user.get_profile()
profile.mugshot = self.cleaned_data['avatar']
profile.save()
return new_user
Source:stackexchange.com