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Your elbows should be bent and wrists recocked at the swing's finish.
Column courtesy of Golf Digest
I can tell a lot about a player's swing, diagnose the faults and advise how to fix them all from checking out the finish position. The neat thing is, you can do the same with your swing.
For example, at the finish your hips should have turned so that they are at least perpendicular to the target line. Your shoulders should also be perpendicular to the target line.
Your elbows should be bent, wrists recocked, belt buckle facing the target and weight over your left foot (right).
Now for reading faults by looking at the finish. If your hips are less than perpendicular to the target line when your arms and hands are all the way through and the clubshaft is more vertical, you've likely made a hook swing.
If your hips have turned past perpendicular to the target line at the finish, with the clubshaft more horizontal, and your wrists aren't recocked nearly as much as they should be, you've likely made a slice swing.
Check out your finish in a mirror, and try to ingrain the right positions in your real swing.