Width height value for images

[CornerLeafe]

Hello friends. I am writing here because the topic is related to SEO. When I analyzed my page on Google Pagespeed tests, it says that the image does not have clearly specified width and height values. In terms of SEO compatibility, should images in Responsive designs be given width and height values in pixels? As you know, it is given as a percentage according to the screen. If it needs to be given, for example, if the image is 1000 X 1000 but we want it to appear as 400 X 400 on the page, should it be 1000 X 1000 or 400 X 400?