It was rejected because the image is underexposed and poorly focussed.
Adobe Stock customers expect the highest visual and technical quality for use in commercial projects. Read these links.
As Nancy indicated, it's not in sharp focus and is underexposed. In addition it's too closely cropped. Photographing and editing flower images is a good way to practice your skills; however, I wouldn't do so with the intent of selling them on Adobe Stock which is already saturated with millions of very high quality flower images. If you search the Adobe Stock database for "white+flower" 9.7 million images will be returned!
Thank you for help:)
I'm still learning so all comments are welcome.
Para hacer fotos de este tipo te recomiendo usar un objetivo macro o usar tubos de extension, asi podras hacer larga exposición y enfoque preciso con una buena profundidad de campo y bien iluminada, siempre con tripode naturalmente.