Django - model images are not loading

I add a ImageField model in my models and save the photos in my project folder. I send the objects to my template but I can't load the images. My app name is observatory and I can have other parts of models except images.

Here is my code :

Models.py :

Class Observatorys (models.Model):    ...    photo = models.ImageField(upload_to = "photos/%Y/%m/%d")

Views.py :

From .models import Observatorysdef Observatorys(request):    Observatorys = observatory.objects.all()    context= {'observatorys': observatorys}return render(request, 'observatorys/observatorys.html', context)

Urls.py :

urlpatterns = [path('',views.observatorys,name="observatorys"),path(,'<int:observatory_id>', views.observatory, name="observatory"),

Template.html :

...<img src="{{observatory.photo.url}}">...