ArrowSize (2) 

The default arrow size is Medium, which corresponds (roughly) to "ArrowSize"→1.5:

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Change the arrow size of each vector:

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LocatedVector (2) 

A located vector from the first point to the second point:

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Setting the located vector to False draws the vectors located at the origin:

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A list of lists of pairs of vectors with the option "LocatedVector"→True draws located vectors from the first point in each sublist to the second point in each sublist:

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Without the option being set, the second tuple in each list gives the located point, and the first tuple gives the direction:

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VectorStyle (2) 

Change the style of the vectors:

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Set both the arrow size and style for each vector:

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