If I see one more flower, I think my head will explode. 😵
Stock already has 25 million roses in every size, shape, color and variety. Even if you get your rose accepted, you'll make next to zero in sales from it. Focus your time and camera lens on subjects nobody has thought of before.
Go out in the world and look at ordinary objects in new & interesting ways. Check your light levels, watch your depth of field and if needed, use a tripod to stabilize your camera.
If you're new to photography, enroll in some photography courses and join a photography club. It's a great way to meet new people and learn from fellow photographers. Have fun!
In addition to the technical issues described by @Abambo , I would point out that the Adobe Stock database is already overrun with floral images. Search on "yellow flower" and you'll get more than 5.5 Million matches! While it's good to practice your photography and editing skills on flowers, I wouldn't bother uploading them to Adobe Stock. The chances that you would ever sell any are close to nil.