If you've seen my other posts you know that I prefer a flat/open hand follow through (like Ray Allen).
However, like I always say, there are many aspects of shooting where there is no SINGLE correct methodology. Many great shooters release with a floppy wrist (Steph being the most prominent), and follow through with their fingers curled (index finger pointed). This is a natural result of snapping the wrist when the hand and fingers are very relaxed (your fingers want to curl up).
This is a true GOOSENECK follow through. If it works for guys like Klay Thompson, it may work for you. Take after the greats while still maintaining your own unique technique!