Oh, definitely. A smile can be stuck on during the whole skate. Still, you can often enough see when skaters love what he/she/they do(es). That doesn't mean they have to be smiling all the time. That's not it.There are two things:
1. Loving what you do.
2. Being joyful after the skate.
The fact that you are smiling during the skate does not generally mean you are happy.
The fact that you are sad after the skate does not generally mean you do not like what you do.
People sad after a particular skate usually are unhappy about what they did in that specific programme, irt doesn't mean they don't love what they do at all.