Is it possible to place images of my work on my business card site (business card site of a designer or front-end developer)?

Question

Copyright

I work as a frontend developer. Decided to make a business card site. I want to post screenshots of my work on this site. Here a number of questions arose.
1) Do you need customer permissions for this?
2) If permission is not needed, then what to do with the content of the site? I didn't write the text. Can I post a screenshot of the site along with the content?
Please confirm your point of view with references to some articles of the civil or some other code of the Russian Federation.

Answer 1

If you didn't sign the NDA, you can

Answer 2

Dear TS, can I ask an indiscreet question?) What is more important for you in your work - the absence of lawsuits or a good professional reputation? Because if the latter, then to hell with the codes - in any case, you should first ask the site owners if they are against blah blah blah. Because the law is one thing, and the desire of individual customers to keep secret which freelancer made the frontend is another.

Answer 3

You are the author of a product or part of it. Your customer has the rights to distribute it. As far as I remember, the human description of the chapters on copyright from the Civil Code.
According to the idea of ​​advertising their work - is the distribution of this work. These rights do not belong to you. Therefore, you need to ask permission. Usually, such permission, as well as the signature "Developed by %name%" at the bottom of the page, are negotiated in the contract.