bob
and person
are the same object,
person = Person.objects.get(user=request.user)
bob = Person.objects.get(user=request.user)
So you can use just person for it.
In your template, check image
exist or not first,
{% if person.image %}
<img src="https://stackoverflow.com/questions/15322391/{{ person.image.url }}">
{% endif %}