Here I am attching 3 more images those images also got rejected due to technical issue those images are not captchured It is developed by me in photoshop.
Stock photography is not as easy as it seems; it's more than just uploading pictures to stock platforms, although some are not very fussy in what they accept. Therefore, this gives people a false impression that any photo will be accepted and are disappointed when their image is rejected - like in Adobe Stock!
I really wouldn't bother with flower photos. They are unlikely to sell. Especially in the way that most people upload them, even if they are accepted.
Along with what's already said, your framing is also underexposed. Zoom in to between 100 and 200% to check your files before upload. They need to be sharp on the edge, Look at photos that are accepted to get an idea of exposure. Along with the links that was shared with you also go through this list and you might want to get some basic info about photography either from books or courses. LinkedIn Learn has some good courses you might want to try.
in addition to have low contrasts. There is not much you can do with a phone picture like this.
Also your cropping is not the best.
To get flower pictures accepted in this highly competitive field, you need to have perfect pictures with a wow factor. And that will give you still very low number of sales.