Tired

I try sometimes to do portraits and what I like about it is when people are not aware of me and they deliver a spontaneous and sincere expression of joy, sadness, anger, ....
If you shoot a portrait of an animal is even better, since he/she/ is not aware of what a camera really is and what I am about to do....is there any other word you would use beside "tired" to summarize Lilly's emotions here? Tough call!