$ cat /etc/salt/files/base/env_ops.sls:
ops-repo-master:
  cloud.present:
    - name: ops-repo-master
    - profile: ops_box_micro
    - provider: ops

$ cat /etc/salt/cloud.profiles.d/ops.conf
ops_box_micro:
  provider: ops
  image: ami-c30360aa
  size: Micro Instance
  ssh_username: ubuntu
  rename_on_destroy: True
  delvol_on_destroy: True

There's a matching ops provider in /etc/salt/cloud.providers.d which I won't quote here as it has AWS keys etc.

This works:

$ salt-run cloud.profile ops_box_micro ops-repo-master
...stuff

This FAILS:

$ salt-run state.sls env_ops
[ERROR   ] Failed to create VM ops-repo-master. Configuration value 'image' needs to bt
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/salt/cloud/__init__.py", line 802, in ce
    output = self.clouds[func](vm_)
  File "/usr/local/lib/python2.7/dist-packages/salt/cloud/clouds/ec2.py", line 907, ine
    image_id = vm_['image']
KeyError: 'image'