It is illegal to save pictures from the Internet without permission from the copyright owner. The only way to legally use a copyrighted image is to obtain a license or an assignment from the copyright owner.
Copyright laws protect the intellectual property of the creator of the image. This means that the creator has the exclusive right to reproduce, distribute, and display the image. This applies to all images, whether they are photographs, drawings, paintings, or digital images.
If you want to use an image from the Internet, you must first obtain permission from the copyright owner. This means that you must contact the copyright owner and ask for permission to use the image. If the copyright owner agrees, they will usually provide you with a license or an assignment.
If you use an image without permission, you could be subject to legal action. The copyright owner could sue you for copyright infringement and seek damages. This could include a fine, or even jail time in some cases.
It is important to remember that even if an image is free to view online, it does not mean that it is free to use. If you want to use an image from the Internet, make sure you get permission from the copyright owner first. Otherwise, you could be breaking the law.