Fantastic piece! I agree with you one-hudred twenty percent that these are the best ponies, at least for their generation. I also like your little descriptions of them. I love how you turned the old ponies into 'Generation-Four-Style'. It looks cute and fun!
You did a great job coloring the ponies, as well. You also did a perfect job with Wysteria's mane and tail.
In addition, you did an awesome job capturing each of their personalities, which is difficult when you don't have the motion and sound of animation. Their poses and facial expressions are just right. Star Catcher has that mystical and kind look on her face while Sunny Daze is being a total show-off like always.
All together this is an amazing piece and I love it a lot. Keep up the great work!