A "sophomore" feature is always a big deal, and the reasons should be pretty obvious: the theory is that anyone can get lucky (and make a good film) once, but twice? That is indicative of some actual talent, and it also means a lot more pressure. The "sophomore slump" is not just a sports term. It simply means that a filmmaker must be careful on their second film. My advice? Remember what worked the first time around, drop what didn't, learn from the feedback you received, and don't let too many cooks into your kitchen.