It's a visual novel partially inspired by Katawa Shoujo (as being an independently-produced collaborative effort to make a visual novel). The main character goes to Starswirl Academy to get an education, and there'll be storylines for dating each of the Mane Six. It's called the Zap Apple Project, and the person managing stuff on here is ~Derpiihooves. Check there for links to the Tumblr.
Some say red, some say magenta. The way I figure, it's naturally magenta, but red contact lenses when not wearing the sunglasses, maybe? The glasses are there behind her, you can see a sliver, maybe this was a pose for the photographer to show her natural eyes and outfit.
You gotta think outside the box when dealing with fandoms.
Derpy had normal eyes for about half of the first season, but she's had derped eyes for pretty much all of the second season; even after the edits to "The Last Roundup", her eyes weren't perfectly normal.
And since fanon is more important than canon, which do you go for: Trollestia or Molestia? Mother Derpy or time-traveling Derpy? FlutterMac, CheeriMac, CaraMac, or TwiMac? TwiLuna or PipLuna?
And it's fine if you prefer red eyes for Vinyl Scratch, but who are you to tell an artist how to draw their picture?
canon always wins over fanon, since fanon bases itself around canon with the difference that fanon is more malleable and decides what it wants to be basing itself around canon to most people, Derpy is derp-eyed, to others, she isn't and Scratch never had eye color, only fandom decided to have her eyes red
you decide what do you like, TG does not have to do as you wish