Did you know that there's no need to imprint the word "copyright" or the © symbol or the year on your images?
This has been the case since 1989, when the U.S. joined the Berne Convention.
Marking an image isn't really necessary to establish copyright ownership. That's automatic (unless it's surrendered in some way in writing or by a "work for hire" agreement).
Marking an image simply enhances copyright protection by putting viewers on notice. (Deliberate removal of a copyright protection from an image can be subject to penalties of up to $30,000 US per instance.... but only if copyright ownership has been registered in a timely manner.)
Under the Berne Convention, all that's needed for enhanced copyright protection is a "unique mark". This can be your signature or just about anything you choose.
In other words, imprinting the word "copyright" and/or © symbol and/or year has not been required for almost 30 years... Yet many people still think it's necessary and regularly "ugly up" their images with those unnecessary marks! Design a nice signature or digitize your actual signature or come up with a neat logo instead! That will serve the same purpose.
And if you truly want to enhance your copyright as strongly as possible,
register your copyright ownership! Unless and until that's done in a timely manner, you have minimal recourse if your images are stolen and used without your permission. You're largely on your own in small claims court and only able to ask for "market value" of the usage.
But if your ownership has been registered, you can have your case heard in federal court with professional legal representation, recover your legal costs along with statutory damages, and may be awarded various other significant penalties levied against the image thieves. In the case of a deliberate and significant infringement, unregistered versus registered can easily be the difference between a few hundred dollars and many tens of thousands or even hundreds of thousands of dollars!
More info here:
https://smallbusiness.chron.com/punishment-violating-copyright-laws-55157.htmlNote: There have recently been increased fees for U.S. copyright registration and still more are being considered, along with significant limitations on the number of images that can be registered per instance. Look for more info about this online and for opportunity to give feedback about the changes, if you wish to do so, before the changes get set in stone!