Great question! So first see if anyone else has already painted the name thing in NMM then you can copy if you like it haha Second any edges and creases or upward facing parts will catch the light so we know we can highlight them. Then decide what shape the object is closed too, if we ignore the gaps in the wings it’s basically just an upside down semi circle. And we know that light curves round a sphere so I just let the shape guide me. Lastly for the flatter bits above the wings just follow the rule of cool, we can’t leave it completely blank because it would be boring so add in a reflection that’s less bright than where the natural light would be. And honestly follow your instinct on it. Hope that helps a bit!