pixelated as you forgot to check your link before exporting
image is to dark, light, out of focus etc
have changed your layout after printing, note this is only a minor change in discussion with your teacher.
Swap or adjust the problem images in your In Design layout
Export the adjusted layout as a 300dpi jpeg page (what you always do for printing).
Open the exported jpeg file and crop the row your adjusted image is on. Save. You can you Bridge camera raw, Lightroom, Photoshop or your computer software to crop the image.
Upload the file into the folio reprints assignment. There will be one reprint day only, if you haven't submitted your work on time you are responsible for doing this printing.
Collect your photo print and cut out. Tape the back with double sided tape and stick over the mistake on your folio board print.