Ha, it didn't show the picture when I published these levels.
I took that picture when I visited India.
I got the picture in there with TealPaint / RsrcEdit. (I figure exactly how I did it. ) Master KO's levels have custom pictures too.
You can search the site (search form at top of page) for RsrcEdit, but I don't remember anything about it that's not already posted.
I was never able to get hi-res (16 bit) images in like Master KO, though.