I wanted to practice facial expressions and thought the bat boys should be my subject

Damian is either shocked or disgusted or horrified at what ever he is seeing

Jason is relaxed and smiling which means he probably caught one of the bat fam acting like an idiot and is ready to roast them

Dick is very uncomfortable and wishes to go home and eat his feelings through cereal

Tim is pissed at someone and that is not going to end well for said person