It is not legal to redraw a picture from Pinterest, add color, and sell it without knowing the original artist's identity. This would be considered a violation of copyright law, as the original creator of the image holds the exclusive rights to reproduce, distribute, and display the work publicly. Without proper authorization or licensing, any alterations or derivative works created from the original image would also infringe on the creator's rights.
Pinterest's copyright policies state that only the owner or an authorized person can submit a complaint for copyright infringement. If you are unsure about the original source of an image, it is best to seek permission from the creator or use royalty-free images from sites like Unsplash, Pexels, or Flickr's Public Domain Group. These sites offer free images that do not require attribution or have expired copyrights, making them safe to use for personal or commercial purposes.
In summary, adding color to a redrawn picture from Pinterest without knowing the original artist's identity and selling it would be illegal without proper authorization or licensing from the copyright holder. It is essential to respect the intellectual property rights of creatives and adhere to copyright laws to avoid infringement and potential legal consequences.