Proper Violin position?

I have recently begun playing the violin, Irish fiddle style that is! I played the cello for about eight years so I grasp the concept of stringed instruments fairly well. After less than a week I'm getting some fairly decent tunes out of the thing but I'm concerned with my hold and don't want to develop any terribly bad habits. I am not using a shoulder rest, I'm comfortable enough and don't see the need. Any links to a good diagram or tips would be great! Thank you so much!