That's a lovely, pretty picture of Luna. I really like those shades of blue - and I like how happy she is. Of course, with such a beautiful night, under a star-strewn sky and a beautiful silver moon, who wouldn't be?
Drawing water is just a thing I want to learn, so I hope it's not so difficult as you say.
This drawing doesn't look bad at all! But...I've got a feeling that her right wing looks similar to her hoof, making me confused.
The drawing's quality amazes me. The pony is so awesome and you gave her so much shadows and detail. All the glows and highlights are so great! I also like the background - it doesn't catch so much eye and is well done, especially the flora, the moon and the skies and the water...just everything!