Does your version of wiki support pictures in PDF and/or EPS format?
MediaWiki supports uploading PDF and EPS files with the right configuration. I haven't tried uploading EPS files, but providing thumbnails of these and the PDFs should work.
Im doubtful thumbnails of eps would just work. Pdf thumbs need an extension (pdfhandler) in order to thumbnail correctly. Uploading of both these formats should be fine on vanilla mediawiki with a small config change to add them to the allowed file types list.
-bawolff