You can check the website link in the coming soon thread linked above or
www.strawberryreef.com to see the Fashion Style ponies. If a pony is released in the same packaging in multiple waves she will not be different release to release. But some of the ponies such as Celestia and Luna have minor variances in glitter/pearl coating/tinsel etc which will differentiate depending on which release they are.
Other than Applejack [and Fluttershy], most of them will run on or less than retail in value especially if missing their accessories.
If you cant get pictures you could just tell us which ponies they are as well as any significant features and people will be able to tell you which release they are.