читайте последний пункт:
* Vectors must be archived with a JPEG preview inside a ZIP archive.
* Supported vector formats are AI and EPS.
* To ensure maximum compatibility, please save your vectors for a lower Illustrator version (for example: Illustrator 10).
* Preview resolution must not be less than 2400 x 1600 (4 Million pixels).
* Files must be less than 2 Megabytes.
* You need to be the author of the files uploaded on Fotolia
* Do not upload files with logos or other protected trademarks
* Vectors should be clean files with a lot of detail (simple vectors without creative details will be refused)
* Do not upload vectorized images