What is wrong with these pictures?

Let's be frank: those pictures can't be fixed because of the compositing errors you made:

First picture:

If the weed is your main subject, go down and shoot more of the weed. If you want the iconic bridge in the background, make sure that some of it is in the picture.

Second picture:

If the cactus blossom is your main subject, get more of that in your picture. The background will be a nice decoration, but it should not dominate the picture.

Now lets look at your first picture and what a potential buyer will get, when he looks at the picture at 100% magnification:

You see many artefacts introduced by over sharpening instead of clean and sharp weed and a lens blurred background. The buyer would return the asset immediately, regardless of his use.

Your second picture exposes some defects that are introduced by "smart" in camera processing to produce that nice blurred background that you get with the expensive DSLR or the mirrorless camera. However, that processing makes mistakes that should get your attention when examining your pictures at 100% or 200%.

Those pictures may be great for private viewing at reduced size, but you can't sell this to paying customers.

I suppose that you are using a phone camera. Phone camera pictures may be accepted, but only if they meet the quality requirements applied to all submissions. In camera processing does not help as this processing is mostly done to get your pictures good-looking on your phone screen at a reduced size.  You need to avoid this aggressive and destructive processing. Best would be trying to get raw files (some cameras produce them) and let Lightroom (even on the camera) process the pictures. You will have much more leverage to do that with a serious program like Lr. But please note that defects that are too strong can't be corrected, even if you are a wizard...