The recent game I submitted of FIFA 98 PC Europe apparently didn't upload the images correctly, as I've got black boxes with them, and I don't know why that happened. Resubmitted the images as an edit, but I don't know if it'll work this time or not.
https://vgcollect.com/item/171076
Images can be black boxed if they are PNG or are too large. Additionally, this can happen with images with the wrong headers.
Also, I do not think that front art you added is correct. I know it is marked as front art on mobygames for UK, but it is jewel case manual art and not the box front.