{% load staticfiles %}
<img src="{% static "articles/css/base.css" %}" alt="My image"/>

mysite
  articles
       static
       articles
           css
               base.css
  static
       images
       css
           default.css
       js
  templates
       base.html
  settings.py

# looks for static files in each app
STATICFILES_FINDERS = (
    'django.contrib.staticfiles.finders.FileSystemFinder',
    'django.contrib.staticfiles.finders.AppDirectoriesFinder',
)

STATICFILES_STORAGE = (
    'django.contrib.staticfiles.storage.StaticFilesStorage'
)

# the absolute path to the directory where collectstatic will collect static files for deployment (OUTPUT)
STATIC_ROOT = ''

# This setting defines the additional locations the static files app will traverse if the FileSystemFinder finder is enabled.
STATICFILES_DIRS = (
    # used for static assets that aren't tied to a particular app
     os.path.join(BASE_DIR, 'static'),
)

# URL to use when referring to static files located in STATIC_ROOT
STATIC_URL = '/static/'

STATICFILES_DIRS = (
    os.path.join(BASE_DIR, "static"), # That's it!!
    '/var/www/static/',
)