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Look what you've done this time.
Look at what you've done this time.
Now, is using the preposition wrong here? How does one know when to follow look with at, and when not to?
What about these constructions :
Look (at) how much damage you've done. Just look (at) how good my car looks.
Look (at) in your example is used with to attract attention to a possible problem or danger. The preposition "at" is generally omitted before when, what, why etc:
pay attention:
[intransitive, transitive] to pay attention to something look (at something)
Look at the time! We're going to be late.
Look where, what, etc… Can't you look where you're going?*
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