Compare your best work with Stock inventory to ensure that what you're selling is 1) something Stock needs and 2) better than what Stock has now. It sometimes helps to see what your competition is doing.
framing. Composition is an important part of photography and your assets need to be well composed. This picture looks like just an other snapshop. In addition, the asset is not sharp:
You need to check your assets at 100% for errors and artefacts before submitting.
And as a side note: flower pictures are really low intrerest pictures, abundantly present in the database, and won't quite probably never generate sensible amounts of sales.
ABAMBO | Hard- and Software Engineer | Photographer