What is an example of imagery in the novel, The Spanish Love Deception?

Imagery:

As if he was trying to tell me, this way—with them below the table, hidden from everyone else—meant that this was just for us. Not a part of the charade. He squeezed my hand with purpose, his fingers tightening around mine, his palm warm against my skin. Just for us, it seemed to reassure me. To promise me.