This might be a bit cleaner, because you are only determining the queue based on the input. Also I think instance_klass should already be a string.

```ruby
def self.enqueue_delayed_paperclip(instance_klass, instance_id, attachment_name)
  queue = case instance_klass
          when "CustomerPhoto" then :customer_photo
          else
            @queue
          end

  ::Resque.enqueue_to(queue, self, instance_klass, instance_id, attachment_name)
end
```