Hello, I will be assisting you.
You are correct to assume that the images are protected by copyright. Every work created is automatically protected by copyright. There are a few issues you should consider:
1) if you are concerned about copying then you also need to find out if your aunt registered the copyrights with the copyright office. Registering the work would give you the maximum protection. Otherwise, for the most part the damages you can claim if there is an infringement are limited
2) another issue is that generally speaking when you sell a work of art you also sell the copyrights associated with it. To prevent your buyers from copying the works you would also need to enter into a license agreement with them
As far as "copyright stamps" there is no such thing as a copyright stamp. In the past the symbol circle C used to be noted on the work but these days that is not necessary. As noted every work is automatically protected by copyright, but to be able to claim that protection you would also need to register the work with the copyright office.
As far as protecting the images from being copied while being displayed online, there are ways to prevent visitors from being able to copy images, you would need to discuss with the website's webmaster about deploying copy prevention measures.
In conclusion, your best measure of legal protection is to register the works with the copyright office. The may have already been registered you you would first need to find out if your aunt did that and then either assign the existing registration to yourself or newly register.
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Thank you for the clarifications. One last question please?
If I sell a piece of art along with the copyright, and I make digital images of that work to sell, would I be in violation of copyright laws?
Generally yes because then you would not hold the copyright to the image then. A simple way of doing this legally would be to give yourself a license where you reserve the right to reproduce the image digitally or not to sell the copyrights and only sell the right to use art
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