Well, it's a good start, but since you asked for feedback...
The lower part of the stalk looks a bit too thick, the outlines of the eyes should be blue instead of black and there are too few petals.Reference pic
Also, is the sprite being hi-res intentional? While it would certainly not be the first sprite like this in the program, it does clash somewhat with the pony sprites in my opinion.
Don't let this discourage you, though. Like I said, it's a good start.
And eh... maybe it's just me and I won't put too much effort into trying to dissuade you from it if everyone else is okay with it, but surely there must be a place better suited for you to plug your fanfic spinoff... thing.