Well, it should depend on the average wingspan of the species. Like how Rhys, Cassian, and Azriel are Illyrian. Rowan's animal form is a hawk. So compare Rowan's wingspan to that of an average hawk and THEN you'll get the size of "other parts.
Passive aggressive and sexual tension vs sarcastic insults and Rhys purring
Rhysand is humble, respectful and understanding. He admires Feyre and knows she is his equal: THAT is why Rhys is perfect and kind and wonderful and Tamlin is just a tool. To add to that no one likes Tamlin and he can go piss off.