25 Minute sketch

Lately I have been doing a lot of research about animation, and I realized that one of the most important skills one should own to do 2d animation is knowing how to draw. So, to improve my drawing skills I have proposed drawing sketches in 25 minutes minimum. Here are some of the drawings I have done:

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The purpose of this, as I mentioned before, is to polish my skills and learn new things. Until now I have only drawn faces, but I plan to draw complete poses.