At first glance, the main thing that can be seen is that she's tall. Not Luna tall, but close. As a result, she's always looking down to the more normal sized ponies.
She's a unicorn, her fluffy coat a dark red shade. Her long, silky mane is nearly floor touching, her tail definitely so. It's all dark blue. Throughout this fluff and hair are the occasional white spots, very tiny, like the stars at night. They get more and more frequent as they near her cutiemark, which shows the silhouette of a pony staring up at a shooting star.
Speaking of that area, her rump is huge. Massive, soft, better than most any pillow. This isn't to say she's fat, she's actually thin, but very soft. Her legs still have a strong look to them though, she's a bit muscular, nothing special.
Moving up to her face, her eyes are unique. They're heterochromatic, the left one a bright red, the right a dark green. Her plump lips look soft, great to hold against one's own in moments of passion.
Seeing your curiosity, she opens her mouth wide for you. The teeth are very well cared for, her equine tongue large and wet, the strong muscle eager for love. She closes it before you get any ideas though.
Looking at her more, you see the long horn on her head.
If you were to get a more intimate view, you'd find that her teats are a bit big. She is a mother, after all... She wouldn't mind having more.
Her talent is granting wishes, though she cannot control it, nor does she know other magic. If someone says, for instance, "I wish I had an apple." near her she would be forced to grant the wish. If a wish is too much for her, she will pass out.