What are the pixels and dimensions for best header photo?

I am having a custom header made for my website and I want to make sure I provide the graphic designer with the correct pixels and dimensions. Can you please confirm? Thank you!

Here is my website - x7c.6a6.myftpupload.com

Hello, sorry for a delay, this topic was missed for some reason.

Anyway, your header looks great with Full HD image, so I’ll close this topic.

Please feel free to create a new topic if you have any other questions.

Kind Regards, Roman.