Answer:
Tonia is a very expressive person, while Robert is more reserved.
Step-by-step explanation:
Tonia is very easy to express what she is feeling. She makes her emotions very clear, because she can externalize them so quickly. Therefore, by looking at Tonia we are able to identify that she likes Robert, and we are able to identify any other feelings she may be feeling. Tonia is very expressive.
On the other hand, Robert is a more reserved person. He has difficulty expressing his feelings, although he can develop strong and impactful feelings. Robert likes tonia, but unlike her, he can't externalize his emotions, so we can't know what he's feeling when we look at him.