btw nice draw!
In some ways, I never really studied pony anatomy beyond the head; when it comes to drawing bodies I usually wing proportions with two circles and go from there. That affords me more freedom in using foreshortening, but drawing bodies normally slows me down.
Oh yeah, shadows in perspective are fun stuff. The weapon-wielding ponies I've been doing lately kinda use that.
If I had to point out one reason foreshortening is difficult at times, it would be because going by skeleton approaches looks downright bizarre at first. But it wouldn't hurt to try it now and again, even if it flops. Gotta learn somehow, right?
Word of advice. Just don't lose focus on enjoying what you do. If you stress it too much, it will be more like work, and it will no longer be fun for you. Set your imagination free!
She's adorable rolling around in the grass like a happy filly. She looks so sweet and pretty, plus it's always fun to see her being a bit (or a lot) playful. Excellent job on her face, though the rest of her is really good too.
Much as I love the daily Luna pictures I'm glad you're trying to kick things up a notch. It'll be neat to see what you're doing as part of your progress.