Now, I use "ACDsee" in Full Screen [Ctrl-F] with the picture to center it in 800*600.
And capture this images with "Paint Shop Pro" capture option. Here the new result. (again 1/2 real size)

Step 3 is the Big job of editing the picture. After plenty of hours or days. (I'm not artist) That's the result. (again 1/2 real size)

I use the option "Save as" [F12] of "Paint Shop Pro" and select "BMP" as new type and give it it's final name.
And that's it for the wallpapers..... See next Step for the icon job.