Need some explanation why my pictures were rejected

Apart from what's been said, anything you submit to Stock must be legally clear for commercial use on posters, billboard ads, TV commercials, magazines, merchandise, etc...  Signed model/property releases protect everyone from possible legal problems later, including you.  😉

Take blank release forms with you when you travel.

IMG_1790.jpg - technical issues are overexposed sky and soft focus; however you have multiple issues as well including logos, license plates and recognizable people, which would require model releases and property releases. 

IMG_2114.jpg - chromatic aberration and blownout hot spots. The artwork would be an IP issue; you'd need a property release from the artist.

IMG_2114.jpg - chromatic aberration, artifacts in the sky, blur; IP issues due to recognizable people 

Many images appear technically ok when viewed at small size, however you must zoom in 100-200% and inspect every part of the image carefully.

Read Adobe's help pages on IP:

https://helpx.adobe.com/stock/contributor/help/model-release.html

https://helpx.adobe.com/stock/contributor/help/property-release.html

Hello,

Basically, your focus and composition aren't so good. You also can't take pictures of artwork unless you have an IP release.

There are a few things you should read when submitting to Adobe Stock:

User guide:

https://helpx.adobe.com/stock/contributor/user-guide.html
Exposure:
https://www.adobe.com/creativecloud/photography/discover/exposure-in-photography.html
Composition:
https://www.adobe.com/creativecloud/photography/discover/photo-composition.html

Have a read about IP release requirements:
https://helpx.adobe.com/stock/contributor/help/property-release.html
How to upload a release
https://helpx.adobe.com/stock/contributor/help/upload-a-model-or-property-release.html
https://helpx.adobe.com/stock/contributor/help/known-image-restrictions.html

Have a read of this. It's a brief guide on quality:
https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html#:~:text=1%20The%20most%20common%20problem%20is%20excessive%20noise%2C,it%E2%80%99s%20easier%20to%20keep%20your%20sensor%20clean.%20