Look it

"One morning, when a snow-crusted engine dragged its long string of freight cars and its one passenger coach to the station, Scully performed the marvel of catching three men. One was a shaky and quick-eyed Swede (...); one was a tall bronzed cowboy (...); one was a little silent man from the East, who didn't look it, and didn't announce it." ("The Blue Hotel" by Stephen Crane) http://www.4literature.net/Stephen_Crane/Blue_Hotel/

Could you please tell me how a shaky and quick-eyed man looks like, and what the author means by "who didn't look it, and didn't announce it?"

Thank you so much in advance.

Cadzao