Yeah the only way for illustrators that do vectors is to upload via the web form as FTP isn't supported. You'll start with the EPS file then another box will show up to the right where you'll browse to put in the jpg file.
Or you could just upload the EPS file they'll genereate the thumbnails and you can copy and paste your title, description and keywords in. I had to do that on a few occasions when the system decided that my images should be marked as editorial and they're not.