We're always happy to critique rejected assets, but try to keep it to a max of two or three at a time. As we are volunteers and contributor ourselves, we discourage contributors from asking for help with assets they have yet to submit for review.
Adobe Community Expert | If you aren't submitting your assets in sRGB, you probably didn't read the rules.
Photography is a good deal more than point & click. It requires technique, talent and a working knowledge of what your camera and lenses can do in various lighting situations. Start by reading the documentation that came with your camera & lenses.
Consider enrolling in photography courses to learn the basics of composition, lighting, focal distance, depth-of-field (focus), and photo correction in Photoshop or Lightroom. Joining a local photography club will help you gain some practical experience.
In the meantime, compare your work with available Stock inventory. To be accepted, your assets should be better than what Stock is selling now.
I agree with comments from other community members.
Unfortunately, AI is really good creating flowers that only the trained eye can see.
But, if you're really into shooting flowers, try doing something that is really outside the box.
Play using backdrops that give a unique look to your photos, get much closer and definitely use a tridod to increase depth of field, as well as adding some available light that you can properly color balance for your scene.
I wouldn't bother resubmitting the flower. There's simply too much competition, and Adobe doesn't need more floral images. Regarding the butterfly image, it needs some cleanup and a drastic crop, which might reduce the file size below the minimum acceptable file size.
I would suggest you do a search for "flowers" on stock.adobe.com and take a look at your competition. Flower images are plentiful on Adobe Stock and the competition is very stiff, even if they get approved.
Adobe Community Expert | If you aren't submitting your assets in sRGB, you probably didn't read the rules.