Drink up moho's!!
Yeah it looks like your fists are balled up which will add tension into your running form. Also it looks like you carry your arms high as well. Dropping them down closer to the waist will help.
BUT . . . You got a damn good picture there with your overall look and the background.
I like to think of the arms as simply being along for the ride. Your legs are driving the locomotive; what your arms do is purely for balance and I would let that be.