Sometimes, when you work with directors who have done it a lot and are established in the business and know the game, there are all these rules that they have. First-time directors will allow you to come in with choices. They're not so jaded by actors that they're like, 'Ugh, just do your job, man.'
It wasn't a problem for me drawing humans although I had originally come to the studio with the idea that what I had to offer them was my knowledge in the drawing of animals.