IIS7 is great for that because you can remove anything that you don't need from the pipeline. i.e. session state, non-used authentication, non-used logging, isapi filters, webdav, etc. I don't have a doc to refer to you, but if it's a fresh server that you don't mind breaking when setting it up, what I suggest is to take a backup before starting, then edit your applicationHost.config file with notepad or your favorite text editor. (%windir%/system32/inetsrv/config)
The section defines what parts of IIS are run. You can do this with Server Manager too, and make sure that you install just the basics. You should be able to get down to just 5 or 6 modules since you're serving up static pages. You may not even need compression or DefaultDocumentModule for a static-image-only server.