Wow, she's really cute Me like flower ponies!
Her color pallet is really good, too... that's not very helpful, is it? I really don't know how I could help you improve her. She already looks beautiful. I love the green in her eyes/cutie mark and that shade of red is great. The gray seems a little desaturated, but it doesn't look bad.
The mane and tail design are very simplistic, and it looks a character that would be on the show. I'm not a fan of overcomplicated styles, and I think it looks good.
Are you planning on giving her a backstory and personality? I'd like to know more about this pony!