Hai! Welcome to /art/ and the herd /)! :D
As for these pics...
They looks pretty nice to me. Question, it looks like you pretty much redrew the same concept art Faust had. Because I know when I did that I was all like "wow, I'm really good at drawing ponies!", then I started drawing them on my own and they didn't turn out as good. From what I saw it looks like you just redrew the original art. That's fine for a start, I know I started that way, but this is only a warm up; use this practice to draw your own scenes and practice visualizing pony anatomy. Here are a few of the tutorial vids I used when I started out:
Definitely use official pics for reference but no need to copy them completely. You seem to have a steady hand, so I'm sure you'll do fine with your pics. Good luck!
The only thing that I see weird in this are their sharp muzzles, but that is more than likely because the concept art looked that way; so it doesn't really count I guess.