Steve looks at the world with curiosity, eagerness, and willingness. Willingness to jump in, to act. Sometimes that inquisitiveness is trumped by other expressions  —  like the boy-whose-hand-just-got-caught-in-the-cookie-jar look that crosses his face now. His mouth falls open, his ears feel hot...

He drops his gaze, grinning shyly. After a minute or two, he chances a small, awkward wave.

And then he picks up his pencil.

He's not the best at striking up conversation with women, especially when that woman didn't come with him and is standing a good fifteen feet away. Bucky knew all the lines, how to smile just right  —  Steve just knew how to be nice. Which is why he motions to his pad, and arches his eyebrows, waving his pencil in the air to ask her permission.

You mind if I draw you, ma'am?

Yeah, he's not good at talking to women, but he's great at miming niceties.