Hey!
Yes, the board is still active, but intermittently. It can take months for new content to get made, even by the fans (I know I had that story lying arund somewhere...)
As for the picture, at first glance it looks great, but on closer inspection the legs are a bit wonky. That said, the actual Filly legs are wonky too: when stretched, they're straight tubes, you don't see the 'heel' portion that's so obvious in other styles or horse drawing. That's true for both the 2D style and the 3D models (insert random gibberish involving topology here). So yeah, you have some leeway with that. Other than that, no remarks. Welcome to the fandom, pick up your shovel on the right and dig into the trenches. ^^