When i creating raw image using cui helper, then first it shows the rust logo, and then the picture that I specified in the url parameter. Is it possible to somehow remove the rust logo, or immediately upload a picture by url?

It's probably doing this because there is delay between fetching the image from the url, then displaying it. One way around this by caching image onto the player client. You can either do this yourself or you can just use Image Library (https://umod.org/plugins/image-library) which does this for you.

thanks)