I didn't reference the anime, they're just supposed to be forget-me-nots. I didn't reference pictures of forget-me-nots either, I just made those up, but there are some species are shaped like the ones I drew.
The anime has forget-me-nots. I just thought it was slightly sad how the image of Menma is so close to the style of the anime and that the flowers weren't. But that's just me being nit picky. I'm generally nit picky when I see an art that has a LOT of favourites and comments.