Usually, when doing something like that (assembling multiple images onto a page), you don't want to do it in a pixel-painting program.

I know you've already solved your problem, but in the future, you might get better results by placing the images into a desktop publishing program or a word processing program. That's the sort of thing I'd use Corel Draw for, usually.

The reason: No sense in trying to turn every dot on the page into a unique pixel in a huge page-sized pixel image file. Just duplicating the single photo in a page layout program means that the file only has to store the photo once instead of many times, and only has to send the photo to the printer's memory once instead of many times. I would also choose to use a page layout program because then I wouldn't have to worry about the photo's resolution when I resized it (page layout programs don't resample the pixels of the photos when you change their size).