All four entrances can see a gargoyle statue almost immediately. The only other chamber that has a similar gargoyle is chamber 4, but its not so close to an entrance and Chamber 8 but its overlooking a blood pool. Once you know you have a gargoyle statue, look if you have a large wall and hooded statue to know if you are at Entrance 1. For Entrance 1 and 2 collect the lower reward then head to the bough. For entrance 3 and 4 you can path a bit higher to check the upper reward before heading to the bough.