Hi @derimo. Sorry if it wasn't clear, but you need to link each source reference to the actual page where that image can be found, not to the main Pixabay site. If you cannot find them again, then you'll need to replace the images with new ones.
We hope you understand. Anyone can say "I found these on a free image site." But we do actually need the direct source for each image. To do that, you need to copy the URL of the page when you open the image, and that is your source. If you look around The Ink Well site, you will see this is how everyone references their image sources.
Thank you!