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Just an ordinary pen
If on that right now do you stop drawing the lack of necessary materials (paints, canvas, brushes, etc.), just take a look at the amazing work the Portuguese Samuel Silva. This artist manages to create incredibly photorealistic paintings, using when they are created only colored pens. For example, a tiger in the beginning of the post from the artist took 50 hours, some other work takes even longer.
Source: mirfactov.com/
