short

When you sign "short" you need to choose your meaning. Do you mean "short in height" or "short in length or duration?"

short in height:
Notice the right hand is slightly bent at the large knuckles.

SHORT as in "length or duration." Note: both hands are in "h" handshapes. The right hand moves, the left hand is stationary.
Use a double motion. If you use a single, quick, larger, outward motion it means "brief."

SHORT as in "short while," "soon," "not long"

SHORT as in "brief." Use a single quick movement of the right hand and extend the movement a bit farther into the air.

SHORT-SLEEVE:
Use a slicing movement to show the length of your sleeve:

Note: If you were "short on cash" you would sign MONEY, (negative headshake)-ENOUGH. (Or some other similar set of signs.)