The only canon Pony that I draw from memory is Twilight Sparkle. I don't know why, but it is so much fun to draw, especially making it stereoscopic 3D using Colors! 3D.
If you want to critique this, wear your 3D glasses. I know that there will be gaps between the layers, but this is created by Colors! 3D. I was going to edit it with MS Paint, but the quality of the picture from the Colors! 3D application is not great of a quality of a bitmap image.
Twilight Sparkle belongs to Hasbro.