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Both are correct.
In the first sentence, you say that you’ve already drawn 50 drawings.
In the second sentence, you say that you set out to draw 50 drawings in the morning, and have been doing it ever since. You may have finished only 10 of them by now, or only 49 out of 50. It’s unclear how many of the 50 drawings you’ve already finished at the time of speaking.
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