I'm very new at photography and I don't understand what did I do wrong with this photos.
Adobe says the reason is quality issues and I'll like to learn what to avoid in the future.
I'd appreciate your feedback.
The depth of field is too shallow, resulting in parts of the flowers being out of focus. You would probably have received a rejection on a few of them for "similars" - too many of the same or very similar composition/subject is not desired.
@Jill_C is right about the depth of field. Use a tripod and experiment with different focal distances and camera settings to achieve the best possible focus on your subjects. Automatic camera settings can be deceptive because the sensor trains more on one subject than the other.
Don't be discouraged though. Photography is a constant learning experience.
besides what was said already ...
Before you submit, please review the submission guidelines carefully and compare your work with other Stock inventory. To be accepted, your work should be as good or better than what's already represented in your keyword category.
Hope that helps.
Just bear in mind, that there are a gazillion flower photos in stock. If you take them, make absolutely sure they have the 'Wow' factor.
Like, "Wow, that's a fabulous photo of a flower!!"