I found a beautiful range of butterfly illustrations on the vintage printable website. Here’s a ‘before and after’ image of one I worked on earlier:
First I printed it and re-scanned it at 1000 dpi. Then I removed some of the yellowness from the background and generally lightened it to allow the butterflies to be the main focus point of the image. I also removed the darker shadows around the edge of the image using the burn tool.
I plan to do a set of these, I think they’ll make lovely note cards.