If you have 3 images it is OK to name them "image1.jpg", "image2.jpg", "image3.jpg", but that is done in your graphics program, not in DW, and the images saved to your images folder within your website folder.
Your html files and more importantly your index.html file should be in the root folder.
The root folder is the one you call harrykoopman and your html files should be directly in this folder not in a subfolder called www. Next you have an images folder in the harrykoopman folder and so the link from your html files to the images would be as follows:
It is best to provide a link to your website, that way we can look at the code directly. However, if the paths to your files are incorrect or the files are not uploaded we will get error messages.