I agree with the others. Its hard to tell. But if I took a venture I would say try lengthening it about 1/2". Are you bending your bow arm slightly at full draw? YOu do look a little short.

I like to anchor with my index finger knuckle in the little "hole between my ear and jaw. With my draw correct, this places the string right on the tip of my nose. Then I set my peep to that spot. If you shoot a string loop, you can sometimes shorten it up a tad to get it perfect. When I first install a loop on my strings, it stretches a little for a while. I notice it right away and have to shorten it to get me back to perfect again.