One of the benefits of using pex is that it bends quite easily. ON 1/2" stuff, the minimum bend radius is fairly small, and bend supports work quite well to do them. Personally, I'd have avoided those two 90-degree bends on the cold side, and made that a single run...less chances of any leaks, and less dynamic pressure loss. Each fitting somewhat negates the benefits of pex, because they decrease the flow volume and the friction decreases the pressure when flowing (not static). Being on the cold side, not as big of a deal since you'll be mostly using hot.
Since pex is not rigid, make sure that the valve is well anchored so it won't move in/out, or rotate.