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 from django.db import models
from django.core.urlresolvers import reverse


class Gallery(models.Model):
    Title = models.CharField(max_length=250)
    Category = models.CharField(max_length=250)
    Gallery_logo = models.CharField(max_length=1000)

    def get_absolute_url(self):
        return reverse('photos:detail', kwargs={'pk', self.pk})

    def __str__(self):
        return self.Title   '_'   self.Gallery_logo


class Picture (models.Model):
    Gallery = models.ForeignKey(Gallery, on_delete=models.CASCADE)
    Title = models.CharField(max_length=250)
    Artist = models.CharField(max_length=250)
    Price = models.CharField(max_length=20)
    interested = models.BooleanField(default=False)

    def __str__(self):
        return self.Title
  

Я получаю эту ошибку ниже

 TypeError at /photos/gallery/add/
_reverse_with_prefix() argument after ** must be a mapping, not set
Request Method: POST
Request URL:    http://127.0.0.1:8000/photos/gallery/add/
Django Version: 1.10.1
Exception Type: TypeError
Exception Value:    
_reverse_with_prefix() argument after ** must be a mapping, not set
Exception Location: C:UsersJKAppDataLocalProgramsPythonPython35libsite-packagesdjango-1.10.1-py3.5.eggdjangourlsbase.py in reverse, line 91
Python Executable:  C:UsersJKAppDataLocalProgramsPythonPython35python.exe
Python Version: 3.5.2
Python Path:    
['C:\Users\JK\PycharmProjects\catalog',
 'C:\Users\JK\AppData\Local\Programs\Python\Python35\lib\site-packages\django-1.10.1-py3.5.egg',
 'C:\Users\JK\PycharmProjects\catalog',
 'C:\Users\JK\AppData\Local\Programs\Python\Python35\python35.zip',
 'C:\Users\JK\AppData\Local\Programs\Python\Python35\DLLs',
 'C:\Users\JK\AppData\Local\Programs\Python\Python35\lib',
 'C:\Users\JK\AppData\Local\Programs\Python\Python35',
 'C:\Users\JK\AppData\Local\Programs\Python\Python35\lib\site-packages']
Server time:    Fri, 30 Sep 2016 17:15:55  0300
  

Опять я просто новичок

Вы передаете kwargs в reverse качестве набора, когда это должен быть словарь:

 kwargs={'pk': self.pk}
#           ^