Twain's experience as a Captain would have given him knowledge of the river that most authors wouldn't have. Having traveled the river, Twain was able to describe the banks, the islands, and the beauty from experience. Almost like a painting. His writing and experience leads the reader to be able to envision themselves in Twain's setting. That's an author's true gift~ to take the reader to places they've never been.
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In a play, direct characterization might be provided through lines.
Direct characterization would be when they explicitly tell you something about the character, so a narrator having a line that says "John is tall" would be direct characterization.
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