I think you only need 12/12 of light/dark. 12 hrs of dark i know is needed for proper photo cycle though. I'm not sure if the extra 2 hrs of dark will help any. Don't know that for sure though. Other than that, from what I can tell from your pic, your plant looks pretty healthy. Keep those lights as close as possible to your plants, especially during flower to get the densest buds possible. Good luck! Happy growing!