With this free online tool, you can draw from reference and then easily verify your drawing!
First, select an image you want to use for reference.
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For practice, draw this from reference.
When you are finished, hold your mobile phone over your drawing. Click “Verify”. You will see the image from your camera with overlaid reference image.
Try to match your drawing with the reference image.
Press freeze, study where you deviated from the reference, and fix!