Are my rabbits happy?

I wouldn't see why they aren't happy. Rabbits express themselves in different ways. Mine will lick you to death and bounces around like he's on crack lol. But he is only 6 months old. Start handling them more because you do not want them biting. I don't pick mine up very much (he lives outside in a giant hutch) but i will sit with him and let him hop up on me, or play with him. I usually pet him when he eats. Google 'rabbit posture'. This will help explain how your little ones are feeling.